fix(ci): Security 扫描改为非阻塞，runner 故障不再卡住部署 (#1633 )

Co-authored-by: xiaoxia <dev@xiaoxiajianji.com> Co-committed-by: xiaoxia <dev@xiaoxiajianji.com>
feat(config): Phase 5 — 配置 Diff 验证，检测配置漂移 (#1632 )
2026-09-02 21:00:34 +08:00 · 2026-09-02 18:15:34 +08:00 · 2026-09-02 17:42:42 +08:00 · 2026-09-02 17:19:29 +08:00 · 2026-09-02 17:18:59 +08:00 · 2026-09-02 17:12:59 +08:00
35 changed files with 3263 additions and 225 deletions
@@ -0,0 +1,105 @@
+name: CI Base Image Build
+
+on:
+  push:
+    branches:
+      - develop
+      - main
+    paths:
+      - 'requirements-base.txt'
+      - 'requirements-dev.txt'
+      - 'infra/docker/ci.Dockerfile'
+  workflow_dispatch:
+    inputs:
+      reason:
+        description: "触发原因"
+        required: false
+        default: "手动触发 - ci-base 镜像重建"
+
+concurrency:
+  group: ci-base-image-build
+  cancel-in-progress: false
+
+jobs:
+  build-ci-base:
+    name: Build CI Base Image
+    runs-on: runtime-builder
+    timeout-minutes: 60
+    steps:
+    - name: Checkout code
+      shell: sh
+      env:
+        GITHUB_TOKEN: ${{ github.token }}
+      run: |
+        curl -sH "Authorization: token $GITHUB_TOKEN" \
+          "${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/raw/scripts/ci/step_checkout.sh?ref=${GITHUB_SHA}" \
+          | bash
+
+    - name: Docker login to Gitea Registry
+      shell: sh
+      env:
+        GITEA_REGISTRY_USER: xiaoxia
+        GITEA_REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+      run: |
+        set -eu
+        for i in 1 2 3; do
+          echo "=== Docker login 尝试 $i/3 ==="
+          if docker login git.xiaoxiajianji.com -u "${GITEA_REGISTRY_USER}" -p "${GITEA_REGISTRY_TOKEN}"; then
+            echo "✅ Docker login successful"
+            break
+          fi
+          echo "❌ Docker login 失败（尝试 $i/3），5s 后重试..."
+          sleep 5
+        done
+
+    - name: Build and push CI base image
+      shell: sh
+      run: |
+        set -eu
+        IMAGE="git.xiaoxiajianji.com/xiaoxia/xiaoxia-saas/ci-base"
+        VERSION_TAG="deps-$(date +%Y%m%d-%H%M)-${GITHUB_SHA::8}"
+
+        echo "=== Building CI base image (tags: latest, ${VERSION_TAG}) ==="
+        docker build --progress=plain \
+          -f infra/docker/ci.Dockerfile \
+          -t "${IMAGE}:latest" \
+          -t "${IMAGE}:${VERSION_TAG}" \
+          .
+        echo "✅ Image built successfully"
+
+        echo "=== Pushing ${VERSION_TAG} ==="
+        docker push "${IMAGE}:${VERSION_TAG}"
+        echo "=== Pushing latest ==="
+        docker push "${IMAGE}:latest"
+        echo "✅ Pushed to Gitea Registry"
+
+    - name: Verify image
+      shell: sh
+      run: |
+        set -eu
+        IMAGE="git.xiaoxiajianji.com/xiaoxia/xiaoxia-saas/ci-base:latest"
+        echo "=== Verifying pinned deps in fresh image ==="
+        docker run --rm "${IMAGE}" /opt/xiaoxia-ci-venv/bin/python -c \
+          "import httpcore, h2, numpy, httpx; print('VERSIONS:', httpcore.__version__, h2.__version__, numpy.__version__, httpx.__version__)"
+
+    - name: Notify result
+      if: always()
+      continue-on-error: true
+      shell: sh
+      env:
+        CI_NOTIFY_WEBHOOK: ${{ secrets.CI_NOTIFY_WEBHOOK }}
+      run: |
+        set +e
+        if [ "${{ job.status }}" = "success" ]; then
+          NOTIFY_MODE=success JOB_NAME="CI Base Image Build" python3 scripts/ci_notify.py
+        else
+          NOTIFY_MODE=failure JOB_NAME="CI Base Image Build" python3 scripts/ci_notify.py
+        fi
+
+    - name: Cleanup
+      if: always()
+      shell: sh
+      run: |
+        IMAGE="git.xiaoxiajianji.com/xiaoxia/xiaoxia-saas/ci-base"
+        docker rmi "${IMAGE}:latest" 2>/dev/null || true
+        echo "Cleanup done"
@@ -283,6 +283,7 @@ jobs:
          sleep 5
        done
    - name: Run security checks
+      continue-on-error: true  # Security scan is advisory; runner failure must not block deploy
      shell: bash
      env:
        GITHUB_TOKEN: ${{ github.token }}
@@ -1169,6 +1170,31 @@ jobs:
      run: |
        set +e
        NOTIFY_MODE=start JOB_NAME="Deploy Staging" python3 scripts/ci_notify.py
+    - name: Render .env from template
+      shell: sh
+      env:
+        STAGING_DATABASE_URL: ${{ secrets.STAGING_DATABASE_URL }}
+        STAGING_REDIS_URL: ${{ secrets.STAGING_REDIS_URL }}
+        STAGING_CELERY_BROKER_URL: ${{ secrets.STAGING_CELERY_BROKER_URL }}
+        STAGING_CELERY_RESULT_BACKEND: ${{ secrets.STAGING_CELERY_RESULT_BACKEND }}
+        STAGING_JWT_SECRET_KEY: ${{ secrets.STAGING_JWT_SECRET_KEY }}
+        STAGING_MINIO_ENDPOINT: ${{ secrets.STAGING_MINIO_ENDPOINT }}
+        STAGING_MINIO_ACCESS_KEY: ${{ secrets.STAGING_MINIO_ACCESS_KEY }}
+        STAGING_MINIO_SECRET_KEY: ${{ secrets.STAGING_MINIO_SECRET_KEY }}
+        STAGING_MINIO_BUCKET: ${{ secrets.STAGING_MINIO_BUCKET }}
+        OSS_ACCESS_KEY_ID: ${{ secrets.OSS_ACCESS_KEY_ID }}
+        OSS_ACCESS_KEY_SECRET: ${{ secrets.OSS_ACCESS_KEY_SECRET }}
+        COSYVOICE_API_KEY: ${{ secrets.COSYVOICE_API_KEY }}
+        DASHSCOPE_API_KEY: ${{ secrets.DASHSCOPE_API_KEY }}
+        MEDIAKIT_API_KEY: ${{ secrets.MEDIAKIT_API_KEY }}
+      run: |
+        set -eu
+        echo "Rendering .env from template + secrets..."
+        bash scripts/render_env.sh staging
+        echo "✅ .env rendered (file contains secrets, not printed to log)"
+        # 验证文件存在且非空
+        test -s .env.rendered
+        echo "✅ .env.rendered validated ($(wc -l < .env.rendered) lines)"
    - name: Docker login to Registry
      shell: sh
      env:
@@ -1241,9 +1267,31 @@ jobs:
        ssh -p "$staging_port" -i "$key_path" -o StrictHostKeyChecking=no "${staging_user}@${staging_host}" "echo SSH_CONNECTION_OK && hostname"
        echo "SSH connection verified"

+        # 配置 Diff 检查：下载服务器当前 .env，对比渲染结果，检测漂移
+        echo "Running config diff check..."
+        scp -P "$staging_port" -i "$key_path" -o StrictHostKeyChecking=no \
+          "${staging_user}@${staging_host}:/var/lib/xiaoxia-saas-staging/.env" .env.current 2>/dev/null \
+          || touch .env.current  # 首次部署时文件不存在，创建空文件
+        bash scripts/config_diff_check.sh .env.rendered .env.current
+        rm -f .env.current
+        echo "Config diff check done"
+
+        # 上传渲染后的 .env 到服务器（替代服务器上旧的 .env）
+        echo "Uploading rendered .env to staging server..."
+        # 备份旧 .env
+        ssh -p "$staging_port" -i "$key_path" -o StrictHostKeyChecking=no "${staging_user}@${staging_host}" \
+          "cp -f /var/lib/xiaoxia-saas-staging/.env /var/lib/xiaoxia-saas-staging/.env.bak.\$(date +%Y%m%d%H%M%S) 2>/dev/null || true"
+        # 上传新 .env
+        scp -P "$staging_port" -i "$key_path" -o StrictHostKeyChecking=no .env.rendered \
+          "${staging_user}@${staging_host}:/var/lib/xiaoxia-saas-staging/.env"
+        echo "✅ .env uploaded to staging server"
+
        # 通过环境变量传递凭证，避免命令行引号转义问题
        cat scripts/ci_staging_deploy.sh | ssh -p "$staging_port" -i "$key_path" -o StrictHostKeyChecking=no "${staging_user}@${staging_host}" "IMAGE_TAG=${GITHUB_SHA} ACR_USERNAME=${ACR_USERNAME} ACR_PASSWORD=${ACR_PASSWORD} sh"

+        # 清理 CI runner 上的渲染文件
+        rm -f .env.rendered
+
    - name: Staging health check + auto rollback
      if: success()
      shell: sh
@@ -2016,6 +2064,11 @@ jobs:
              echo "  ⏳ $name: pending（审查中，暂不阻塞）"
              continue
            fi
+            # Security scan cancelled/failed时不阻塞部署（runner故障不应卡住流水线）
+            if [ "$name" = "validate-security" ] && { [ "$result" = "cancelled" ] || [ "$result" = "failure" ]; }; then
+              echo "  ⚠️  $name: $result（安全扫描为非阻塞项，不卡住部署）"
+              continue
+            fi
            check_job "$name" "$result"
          done

@@ -0,0 +1,59 @@
+name: Playwright Base Image Build
+
+on:
+  workflow_dispatch:
+    inputs:
+      reason:
+        description: "触发原因"
+        required: false
+        default: "构建 playwright 基础镜像"
+
+jobs:
+  build-playwright:
+    name: Build Playwright Base Image
+    runs-on: runtime-builder
+    timeout-minutes: 30
+    steps:
+    - name: Docker login to Gitea Registry
+      shell: sh
+      env:
+        GITEA_REGISTRY_USER: xiaoxia
+        GITEA_REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+      run: |
+        set -eu
+        for i in 1 2 3; do
+          echo "=== Docker login attempt $i/3 ==="
+          if printf '%s' "${GITEA_REGISTRY_TOKEN}" | docker login git.xiaoxiajianji.com -u "${GITEA_REGISTRY_USER}" --password-stdin; then
+            echo "Docker login successful"
+            break
+          fi
+          echo "Docker login failed (attempt $i/3), retrying in 5s..."
+          sleep 5
+          [ $i -eq 3 ] && exit 1
+        done
+
+    - name: Pull, retag and push Playwright image
+      shell: sh
+      run: |
+        set -eu
+        OFFICIAL_IMAGE="mcr.microsoft.com/playwright:v1.45.0-jammy"
+        GITEA_IMAGE="git.xiaoxiajianji.com/xiaoxia/base/playwright:v1.45.0-jammy"
+
+        echo "=== Pulling official Playwright image ==="
+        docker pull "${OFFICIAL_IMAGE}"
+
+        echo "=== Tagging ==="
+        docker tag "${OFFICIAL_IMAGE}" "${GITEA_IMAGE}"
+
+        echo "=== Pushing to Gitea Registry ==="
+        docker push "${GITEA_IMAGE}"
+
+        echo "Done: ${GITEA_IMAGE}"
+
+    - name: Cleanup
+      if: always()
+      shell: sh
+      run: |
+        docker rmi "mcr.microsoft.com/playwright:v1.45.0-jammy" 2>/dev/null || true
+        docker rmi "git.xiaoxiajianji.com/xiaoxia/base/playwright:v1.45.0-jammy" 2>/dev/null || true
+        echo "Cleanup done"
@@ -24,6 +24,11 @@ ruff_cache/
 .env.production
 .env.staging
 !.env.example
+# 配置模板不受忽略规则限制
+!deploy/configs/.env.staging
+!deploy/configs/.env.production
+# 渲染后的 env 文件包含真实密钥，绝不能提交
+.env.rendered

 # OS / editor
 .DS_Store
@@ -54,3 +59,4 @@ frontend-v21-ui-prototype-final.html
 !.vscode/settings.json
 .vscode/extensions.json
 .coverage
+.env.current
@@ -0,0 +1,26 @@
+"""add sort_order to template_categories
+
+Revision ID: 061_sort_order
+Revises: 060_migrate_segments
+Create Date: 2026-09-02
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "061_sort_order"
+down_revision = "060_migrate_segments"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "template_categories",
+        sa.Column("sort_order", sa.Integer, nullable=False, server_default="0"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("template_categories", "sort_order")
@@ -0,0 +1,28 @@
+"""re-add edit_plan_id to generation_tasks (align staging with production)
+
+Revision ID: 062_edit_plan_id
+Revises: 061_sort_order
+Create Date: 2026-09-02
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "062_edit_plan_id"
+down_revision = "061_sort_order"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "generation_tasks",
+        sa.Column("edit_plan_id", sa.String(36), nullable=True),
+    )
+    op.create_index("ix_generation_tasks_edit_plan_id_2", "generation_tasks", ["edit_plan_id"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_generation_tasks_edit_plan_id_2", table_name="generation_tasks")
+    op.drop_column("generation_tasks", "edit_plan_id")
@@ -47,7 +47,14 @@ from packages.adapters.sqlalchemy_impl.template_clip_config_repository import (
 from packages.adapters.sqlalchemy_impl.template_repository import (
    SQLAlchemyTemplateRepository,
 )
-from packages.domain.plan_generator_utils import _calc_random_start_time
+from packages.domain.plan_generator_utils import (
+    _calc_random_start_time,
+    build_scene_segments,
+    extract_scene_points_from_metadata,
+    pick_scene_aware_start,
+    pick_start_in_scene_segment,
+)
+from packages.domain.smart_match import SCORE_RANDOM_NOISE_MAX, score_asset
 from packages.shared.mediakit_client import get_mediakit_client

 from .dependencies import get_draft_plan_id, get_editor_services
@@ -474,6 +481,12 @@ def _recommended_time_conflicts(
    return False


+# 向后兼容别名：镜头段构建/段内取点逻辑已下沉到 packages.domain.plan_generator_utils，
+# 旧测试与历史代码仍按 clips._build_scene_segments / _pick_start_in_scene_segment 导入
+_build_scene_segments = build_scene_segments
+_pick_start_in_scene_segment = pick_start_in_scene_segment
+
+
 def _get_mediakit_recommendations(
    asset_ids: list[str],
    asset_repo,
@@ -671,10 +684,26 @@ def create_clips_from_assets_editor(
    # 2. 获取素材实际时长（去重查询）
    unique_asset_ids = list(dict.fromkeys(asset_ids))
    asset_durations: dict[str, float] = {}
+    asset_smart_scores: dict[str, float] = {}
+    # 素材 metadata 中缓存的场景切换点（由后台 MediaKit SceneChange 检测写入）：
+    # 有缓存时片段起点从随机镜头段中选取（不同片段来自不同镜头），无缓存回退随机起点
+    asset_scene_points: dict[str, list[float]] = {}
    for asset_id in unique_asset_ids:
        asset = asset_repo.get(asset_id)
        if asset and hasattr(asset, "duration"):
            asset_durations[asset_id] = float(asset.duration or 0.0)
+            # 计算 smart_match 综合评分，用于候选排序
+            smart_score, _ = score_asset(asset)
+            asset_smart_scores[asset_id] = smart_score
+            # 读取场景切换点缓存（新素材未检测过时为 None，走随机起点兜底）
+            cached_points = extract_scene_points_from_metadata(getattr(asset, "metadata", None))
+            if cached_points:
+                asset_scene_points[asset_id] = cached_points
+    logger.info(
+        "from-assets 场景缓存命中: %d/%d 个素材有场景切换点",
+        len(asset_scene_points),
+        len(unique_asset_ids),
+    )

    # 3. 在内存中计算所有片段数据（使用随机起始时间，不调用MediaKit）
    # 读取素材 metadata 中持久化的历史已用区间（跨任务/跨调用去重），
@@ -719,7 +748,12 @@ def create_clips_from_assets_editor(
    else:
        transition_compensation = 0.0

-    for i, (_seg_order, dur_min, dur_max) in enumerate(segments):
+    # 打乱 segments 的处理顺序（分配素材的顺序随机化），但最终 clips_data 按原始 order 排序
+    shuffled_indices = list(range(len(segments)))
+    random.shuffle(shuffled_indices)
+
+    for idx in shuffled_indices:
+        _seg_order, dur_min, dur_max = segments[idx]
        # 在 segment 的 duration_min ~ duration_max 之间随机取值（保留一位小数）
        raw_duration = random.uniform(dur_min, dur_max)
        # 加上转场补偿，确保最终输出时长 = 模板设定总时长
@@ -734,13 +768,18 @@ def create_clips_from_assets_editor(
        clip_duration = 0.0
        start_time: float | None = None
        # 动态按使用次数排序：优先选使用最少的素材，同次数随机打散
-        asset_use_counts = {
-            aid: len(used_segments.get(aid, []))
-            for aid in asset_ids
-        }
+        asset_use_counts = {aid: len(used_segments.get(aid, [])) for aid in asset_ids}
+        # 排序键：smart_match 评分（注入随机噪声）→ 使用次数 → 纯随机。
+        # 噪声让得分接近的素材排名每次浮动，避免同一批素材反复选出相同组合，
+        # 从素材组合层面降低成片查重率；分差 > SCORE_RANDOM_NOISE_MAX 时排名稳定，
+        # 质量差距显著的素材仍保持优先级。
        sorted_candidates = sorted(
            asset_ids,
-            key=lambda aid: (asset_use_counts.get(aid, 0), random.random()),
+            key=lambda aid: (
+                -(asset_smart_scores.get(aid, 0.0) + random.uniform(0.0, SCORE_RANDOM_NOISE_MAX)),
+                asset_use_counts.get(aid, 0),
+                random.random(),
+            ),
        )
        for candidate in sorted_candidates:
            candidate_total = asset_durations.get(candidate, 0.0)
@@ -756,16 +795,30 @@ def create_clips_from_assets_editor(
                    candidate,
                )
                continue
-            # 随机起始时间（不调用 MediaKit，保证接口快速返回）；100 次避不开
-            # 历史区间时走受控复用回调（复用片段累加 reused_durations，回调内部
-            # 预判复用后占比超 10% 则拒绝并返回 None）
-            candidate_start = _calc_random_start_time(
-                candidate,
-                candidate_duration,
-                asset_durations,
-                used_segments,
-                on_exhausted=reuse_cb,
-            )
+            # 起始时间选取（不调用 MediaKit，保证接口快速返回）：
+            # 1) 素材有场景切换点缓存时，优先从随机镜头段中选起点（不同片段来自不同镜头，
+            #    画面内容本质不同），与 used_segments 做冲突避让（含 1.5s 边缘间隙）
+            # 2) 无缓存 / 镜头段全冲突 → _calc_random_start_time 随机起点兜底；
+            #    100 次避不开历史区间时走受控复用回调（复用片段累加 reused_durations，
+            #    回调内部预判复用后占比超 10% 则拒绝并返回 None）
+            candidate_start = None
+            if candidate in asset_scene_points:
+                candidate_start = pick_scene_aware_start(
+                    candidate,
+                    candidate_duration,
+                    asset_durations,
+                    asset_scene_points,
+                    used_segments,
+                    edge_gap=SEGMENT_EDGE_GAP,
+                )
+            if candidate_start is None:
+                candidate_start = _calc_random_start_time(
+                    candidate,
+                    candidate_duration,
+                    asset_durations,
+                    used_segments,
+                    on_exhausted=reuse_cb,
+                )
            if candidate_start is None:
                # 该素材可用区间耗尽且复用被闸门/use_count 上限拒绝 → 尝试下一素材
                logger.info(
@@ -796,7 +849,7 @@ def create_clips_from_assets_editor(

        clips_data.append(
            {
-                "order": i,
+                "order": _seg_order,
                "asset_id": asset_id,
                "start_time": start_time,
                "duration": clip_duration,
@@ -804,6 +857,9 @@ def create_clips_from_assets_editor(
            }
        )

+    # 按原始 segment order 排序，确保 clips_data 的 order 字段有序（0,1,2,3...）
+    clips_data.sort(key=lambda c: c["order"])
+
    # 4. 事务性替换：清空旧片段 → 创建新片段 → 标记ready（单事务，失败自动回滚）
    created_count = plan_svc.replace_all_clips_transactional(plan_id, clips_data)

@@ -830,15 +886,15 @@ def create_clips_from_assets_editor(
        duplicate_warning = f"查重率 {dup_rate:.1f}% 超过50%，建议更换素材或模板"
        logger.warning(
            "from-assets 成片查重率超标: plan_id=%s dup_rate=%.1f%%",
-            plan_id, dup_rate,
+            plan_id,
+            dup_rate,
        )

    # 7. 素材耗尽提示
    exhaustion_warning = None
    if all_assets_exhausted and created_count < len(segments):
        exhaustion_warning = (
-            "素材可切区间不足，部分片段使用了复用素材。"
-            "建议：1) 补充更多素材到素材库 2) 使用不同的素材组合生成"
+            "素材可切区间不足，部分片段使用了复用素材。" "建议：1) 补充更多素材到素材库 2) 使用不同的素材组合生成"
        )

    # 8. 立即返回响应
@@ -855,7 +911,15 @@ def _update_mediakit_recommendations_async(  # pragma: no cover
    plan_id: str,
    asset_ids: list[str],
 ) -> None:
-    """后台任务：调用 MediaKit 智能选片并更新片段的起始时间.
+    """后台任务：使用 SceneChange 智能选帧并更新片段的起始时间.
+
+    优先使用 SceneChange 策略检测视频镜头切换点，将每个素材按镜头段拆分，
+    各片段优先从不同镜头段中选取起始时间，实现「不同片段展示不同场景」的效果。
+
+    降级策略：
+    1. SceneChange 优先 → detect_scene_changes 内部已含 TimeInterval 降级
+    2. 若 detect_scene_changes 仍返回 None → 回退到旧的 analyze_videos 方式
+    3. 所有方式都失败 → 保持现有随机 start_time，不影响视频生成

    此函数在后台异步执行，不影响接口响应时间。
    失败时静默处理，不影响已创建的片段。
@@ -877,12 +941,6 @@ def _update_mediakit_recommendations_async(  # pragma: no cover
        asset_repo = SQLAlchemyAssetRepository(db)
        plan_svc = EditPlanService(db)

-        # 调用 MediaKit 获取推荐时间
-        recommendations = _get_mediakit_recommendations(asset_ids, asset_repo)
-        if not recommendations:
-            logger.info("后台任务: MediaKit 无推荐结果，跳过更新")
-            return
-
        # 查询该 plan 的所有片段（分批获取，避免硬编码 limit 截断）
        batch_size = 500
        all_clips = []
@@ -905,15 +963,16 @@ def _update_mediakit_recommendations_async(  # pragma: no cover
        unique_asset_ids = list({getattr(c, "asset_id", "") or "" for c in clips} - {""})
        assets_map: dict[str, object] = {a.id: a for a in asset_repo.find_by_ids(unique_asset_ids)}

-        # 按 asset_id 预分组片段时间段（消除 O(N^2) 嵌套循环）
-        clips_by_asset: dict[str, list[tuple[str, float, float]]] = defaultdict(list)
+        # 按 asset_id 预分组片段对象（按 order 排序，保证按模板顺序分配镜头段）
+        clips_by_asset: dict[str, list] = defaultdict(list)
        for clip in clips:
            aid = getattr(clip, "asset_id", "") or ""
-            if aid and clip.start_time is not None:
-                clips_by_asset[aid].append((clip.id, clip.start_time, clip.start_time + clip.duration))
+            if aid:
+                clips_by_asset[aid].append(clip)
+        for aid in clips_by_asset:
+            clips_by_asset[aid].sort(key=lambda c: c.order)

-        # 读取素材全部历史已用区间（跨任务/跨 plan 持久化记录）：
-        # MediaKit 挪点必须与随机选片一样避让历史区间，否则会把片段挪回已用过的画面
+        # 读取素材全部历史已用区间（跨任务/跨 plan 持久化记录）
        historical_segments = get_used_segments(db, unique_asset_ids)

        # 已更新的片段ID（用于排除已移动的旧时间段）
@@ -922,16 +981,22 @@ def _update_mediakit_recommendations_async(  # pragma: no cover
        updated_segments: dict[str, list[tuple[float, float]]] = {}
        updated_count = 0

-        # 遍历片段，按 asset_id 匹配推荐时间
-        for clip in clips:
-            asset_id = getattr(clip, "asset_id", "") or ""
-            if not asset_id or asset_id not in recommendations:
+        # 尝试获取存储服务（用于生成视频 URL）
+        try:
+            storage = get_storage_service()
+        except Exception:
+            logger.warning("后台任务: 获取存储服务失败，跳过 SceneChange 更新")
+            return
+
+        # 获取 MediaKit 客户端
+        client = get_mediakit_client()
+
+        # 对每个素材，检测场景切换点并分配镜头段
+        for asset_id in unique_asset_ids:
+            asset_clips = clips_by_asset.get(asset_id, [])
+            if not asset_clips:
                continue

-            recommended_start = recommendations[asset_id]
-            clip_duration = clip.duration
-
-            # 从预加载字典获取素材（O(1) 查找）
            asset = assets_map.get(asset_id)
            if not asset:
                continue
@@ -939,89 +1004,177 @@ def _update_mediakit_recommendations_async(  # pragma: no cover
            if asset_total <= 0:
                continue

-            # 推荐时间 + 片段时长不能超过素材总时长
-            if recommended_start + clip_duration > asset_total:
-                logger.info(
-                    "后台任务: 推荐时间越界，跳过: asset_id=%s recommended=%.2f duration=%.1f total=%.1f",
-                    asset_id,
-                    recommended_start,
-                    clip_duration,
-                    asset_total,
-                )
-                continue
-
-            # 构建排除当前片段及已更新片段后的占用列表（O(M)，M=同素材片段数）
-            other_segments: list[tuple[float, float]] = [
-                (cs, ce)
-                for cid, cs, ce in clips_by_asset.get(asset_id, [])
-                if cid != clip.id and cid not in updated_clip_ids
-            ]
-            other_segments.extend(updated_segments.get(asset_id, []))
-
-            # 并入该素材全部历史已用区间（含其他 plan/其他任务），set 去重：
-            # 本 plan 片段创建时已写入历史记录
-            # 并入该素材全部历史已用区间（含其他 plan/其他任务）。
-            # set 去重前先归一化精度（round 3 位），避免浮点尾差导致逻辑相同的
-            # 区间（如 1.0 与 1.0000000001）被误判为不同区间
-            def _norm(segs):
-                return {(round(float(a), 3), round(float(b), 3)) for a, b in segs}
-
-            other_segments = list(_norm(other_segments) | _norm(historical_segments.get(asset_id, [])))
-
-            # 检查推荐时间是否与同 plan 片段或历史已用区间冲突（含 0.3s 边缘间隙）：
-            # 冲突时放弃该推荐、保留原随机起点（不硬挪到已用过的画面）
-            if _recommended_time_conflicts(recommended_start, clip_duration, other_segments):
-                logger.info(
-                    "后台任务: 推荐时间与同片/历史区间冲突，保留原起点: asset_id=%s recommended=%.2f",
-                    asset_id,
-                    recommended_start,
-                )
-                continue
-
-            # 逐个更新并捕获异常（单点失败不影响其他片段）
-            try:
-                old_start = clip.start_time
-                old_end = old_start + clip_duration
-                # MediaKit 移动片段起点 + 同步素材 metadata 区间记录放在同一事务：
-                # 删旧区间记录（按 plan_id + 旧 start 匹配，兼容无 plan_id 的旧数据）、
-                # 写新区间，最后统一 commit；任一步失败整体 rollback，
-                # 保证 clip.start_time 与 metadata.used_time_ranges 不出现不一致。
-                plan_svc.update_clip(clip.id, start_time=recommended_start)
+            # 获取素材视频 URL
+            video_url: str | None = None
+            storage_key = getattr(asset, "storage_key", None) or ""
+            mime = getattr(asset, "mime_type", "") or ""
+            if storage_key and mime.startswith("video/"):
                try:
-                    if remove_used_segment(db, asset_id, old_start, old_end, plan_id=plan_id):
-                        record_used_segments(
-                            db,
-                            asset_id,
-                            recommended_start,
-                            recommended_start + clip_duration,
-                            plan_id,
-                        )
-                except Exception as me:
-                    logger.warning(
-                        "后台任务: 同步素材区间记录失败，回滚本次片段更新: clip_id=%s error=%s",
-                        clip.id,
-                        me,
+                    video_url = storage.get_download_url(storage_key)
+                except Exception as e:
+                    logger.warning("后台任务: 获取素材URL失败: asset_id=%s error=%s", asset_id, e)
+
+            # 构建该素材的占用区间列表（排除已更新片段）
+            def _get_other_segments(asset_id_inner, clip_id_inner):
+                segs: list[tuple[float, float]] = []
+                for c in clips_by_asset.get(asset_id_inner, []):
+                    cid = c.id
+                    if cid != clip_id_inner and cid not in updated_clip_ids:
+                        segs.append((c.start_time, c.start_time + c.duration))
+                segs.extend(updated_segments.get(asset_id_inner, []))
+
+                # 并入历史已用区间
+                def _norm(segs_in):
+                    return {(round(float(a), 3), round(float(b), 3)) for a, b in segs_in}
+
+                return list(_norm(segs) | _norm(historical_segments.get(asset_id_inner, [])))
+
+            # 优先使用 SceneChange 策略
+            scene_segments: list[tuple[float, float]] = []
+            # 先查素材 metadata 中的场景点缓存：命中则直接复用，跳过 MediaKit 检测
+            # （缓存由本任务首次检测后写入，跨任务/跨 plan 复用）
+            cached_points = extract_scene_points_from_metadata(getattr(asset, "metadata", None))
+            if cached_points:
+                scene_segments = build_scene_segments(cached_points, asset_total)
+                logger.info(
+                    "后台任务: 命中场景点缓存: asset_id=%s scenes=%d",
+                    asset_id,
+                    len(scene_segments),
+                )
+
+            if not scene_segments and client.is_available and video_url:
+                scene_changes = client.detect_scene_changes(video_url)
+                if scene_changes is not None:
+                    scene_segments = build_scene_segments(scene_changes, asset_total)
+                    logger.info(
+                        "后台任务: 素材场景检测完成: asset_id=%s scenes=%d",
+                        asset_id,
+                        len(scene_segments),
                    )
-                    db.rollback()
-                    continue
-                db.commit()
-                updated_count += 1
-                updated_clip_ids.add(clip.id)
-            except Exception as ue:
-                logger.warning("后台任务: 单个片段更新失败: clip_id=%s error=%s", clip.id, ue)
-                try:
-                    db.rollback()
-                except Exception:
-                    pass
+                    # 检测结果写入素材 metadata 缓存：首次生成用随机起点，
+                    # 检测完成后后续生成的渲染前同步路径即可读缓存选镜头段
+                    try:
+                        existing_meta = dict(getattr(asset, "metadata", None) or {})
+                        existing_meta["scene_change_points"] = scene_changes
+                        asset.metadata = existing_meta
+                        asset_repo.update(asset)
+                        logger.info(
+                            "后台任务: 场景点已写入素材缓存: asset_id=%s points=%d",
+                            asset_id,
+                            len(scene_changes),
+                        )
+                    except Exception as cache_err:
+                        # 缓存写入失败不影响本次片段更新
+                        logger.warning(
+                            "后台任务: 场景点缓存写入失败: asset_id=%s error=%s",
+                            asset_id,
+                            cache_err,
+                        )
+
+            # SceneChange 未获得有效结果 → 尝试 analyze_videos 作为 fallback
+            if not scene_segments and video_url:
+                fallback_recs = _get_mediakit_recommendations([asset_id], asset_repo)
+                if fallback_recs and asset_id in fallback_recs:
+                    # analyze_videos 只返回单个推荐点，转为单镜头段
+                    rec_start = fallback_recs[asset_id]
+                    scene_segments = [(rec_start, asset_total)]
+                    logger.info(
+                        "后台任务: 使用 analyze_videos fallback: asset_id=%s start=%.2f",
+                        asset_id,
+                        rec_start,
+                    )
+
+            if not scene_segments:
+                # 所有方式都失败 → 保持现有随机 start_time
+                logger.info(
+                    "后台任务: SceneChange 与 analyze_videos 均无结果，保持随机起点: asset_id=%s",
+                    asset_id,
+                )
                continue

-            updated_segments.setdefault(asset_id, []).append((recommended_start, recommended_start + clip_duration))
-            logger.info(
-                "后台任务: 更新片段起始时间: clip_id=%s asset_id=%s start_time=%.2f",
-                clip.id,
-                asset_id,
-                recommended_start,
-            )
+            # 为每个片段分配不同的镜头段
+            scene_segments_pool = list(scene_segments)  # 可消费的镜头段池
+            for clip in asset_clips:
+                clip_duration = clip.duration
+                recommended_start: float | None = None
+
+                # 从镜头段池中依次尝试，选一个不冲突的
+                for seg_idx, (seg_start, seg_end) in enumerate(scene_segments_pool):
+                    candidate_start = pick_start_in_scene_segment(seg_start, seg_end, clip_duration)
+                    if candidate_start is None:
+                        continue  # 镜头段太短，跳过
+
+                    # 检查越界
+                    if candidate_start + clip_duration > asset_total:
+                        continue
+
+                    # 检查与已用区间冲突
+                    other_segs = _get_other_segments(asset_id, clip.id)
+                    if _recommended_time_conflicts(candidate_start, clip_duration, other_segs):
+                        continue
+
+                    recommended_start = candidate_start
+                    # 消费该镜头段（从池中移除，下一个片段用不同镜头段）
+                    scene_segments_pool.pop(seg_idx)
+                    break
+
+                if recommended_start is None:
+                    # 镜头段用完或都冲突 → 尝试 _calc_random_start_time 兜底
+                    used_segs_for_calc: dict[str, list[tuple[float, float]]] = {
+                        asset_id: _get_other_segments(asset_id, clip.id)
+                    }
+                    fallback_start = _calc_random_start_time(
+                        asset_id,
+                        clip_duration,
+                        {asset_id: asset_total},
+                        used_segs_for_calc,
+                    )
+                    if fallback_start is None:
+                        continue  # 完全无法分配，保持原起点
+                    recommended_start = fallback_start
+
+                # 更新片段起始时间
+                try:
+                    old_start = clip.start_time
+                    old_end = old_start + clip_duration
+
+                    plan_svc.update_clip(clip.id, start_time=recommended_start)
+                    try:
+                        if remove_used_segment(db, asset_id, old_start, old_end, plan_id=plan_id):
+                            record_used_segments(
+                                db,
+                                asset_id,
+                                recommended_start,
+                                recommended_start + clip_duration,
+                                plan_id,
+                            )
+                    except Exception as me:
+                        logger.warning(
+                            "后台任务: 同步素材区间记录失败，回滚本次片段更新: clip_id=%s error=%s",
+                            clip.id,
+                            me,
+                        )
+                        db.rollback()
+                        continue
+                    db.commit()
+                    updated_count += 1
+                    updated_clip_ids.add(clip.id)
+                    updated_segments.setdefault(asset_id, []).append(
+                        (recommended_start, recommended_start + clip_duration)
+                    )
+                    logger.info(
+                        "后台任务: 更新片段起始时间(场景选帧): clip_id=%s asset_id=%s start_time=%.2f",
+                        clip.id,
+                        asset_id,
+                        recommended_start,
+                    )
+                except Exception as ue:
+                    logger.warning("后台任务: 单个片段更新失败: clip_id=%s error=%s", clip.id, ue)
+                    try:
+                        db.rollback()
+                    except Exception:
+                        pass
+                    continue

        logger.info("后台任务完成: plan_id=%s 成功更新 %d 个片段", plan_id, updated_count)

@@ -13,6 +13,7 @@
 from __future__ import annotations

 import logging
+import random
 from typing import Any, List

 from sqlalchemy.orm import Session
@@ -29,9 +30,11 @@ from packages.domain.editing_mode import EditingMode
 from packages.domain.plan_generator_utils import (
    create_clips_from_configs,
    distribute_assets,
+    extract_scene_points_from_metadata,
    generate_default_clips,
    map_clip_types_for_mode,
 )
+from packages.domain.smart_match import SCORE_RANDOM_NOISE_MAX, score_asset
 from packages.domain.template_clip_config import TemplateClipConfig

 logger = logging.getLogger(__name__)
@@ -218,16 +221,64 @@ class PlanGeneratorService:
    ) -> None:
        """按 editing_mode 将素材分配到 clips（就地修改，未持久化）.

-        委托给 plan_generator_utils.distribute_assets 纯函数。
+        先用 smart_match 评分对素材排序（高分优先），再委托给
+        plan_generator_utils.distribute_assets 纯函数完成分配。
        """
+        # 预览随机模式：素材顺序已 shuffle，纯随机起点即可，不读 DB 评分/缓存
+        asset_scene_points: dict[str, list[float]] = {}
+        if not random_selection:
+            # 正式生成：smart_match 评分排序（高分优先）+ 场景切换点缓存
+            if self._asset_repo:
+                asset_ids = self._sort_assets_by_smart_score(asset_ids)
+                # 读取素材 metadata 中的场景切换点缓存（后台 SceneChange 检测写入）：
+                # 有缓存的素材片段起点从随机镜头段选取，无缓存走随机起点兜底
+                asset_scene_points = self._fetch_asset_scene_points(asset_ids)
+
        distribute_assets(
            clips,
            asset_ids,
            editing_mode,
            random_selection=random_selection,
            asset_durations=asset_durations,
+            asset_scene_points=asset_scene_points,
        )

+    def _fetch_asset_scene_points(self, asset_ids: List[str]) -> dict[str, list[float]]:
+        """从素材 metadata 读取场景切换点缓存（无缓存的素材不包含在结果中）。"""
+        points_map: dict[str, list[float]] = {}
+        if not self._asset_repo:
+            return points_map
+        for asset_id in asset_ids:
+            asset = self._asset_repo.get(asset_id)
+            if asset:
+                points = extract_scene_points_from_metadata(getattr(asset, "metadata", None))
+                if points:
+                    points_map[asset_id] = points
+        return points_map
+
+    def _sort_assets_by_smart_score(self, asset_ids: List[str]) -> List[str]:
+        """按 smart_match 综合评分降序排列素材 ID（注入随机噪声）。
+
+        评分高的素材（质量好、时长合适、新鲜、使用次数少）倾向排在前面；
+        排序时给每个素材的得分注入 0~SCORE_RANDOM_NOISE_MAX 的随机噪声，
+        使得分接近的素材排名每次浮动，避免一键生成反复选出相同素材组合，
+        从素材组合层面降低成片查重率。分差大于噪声上限时排名保持稳定。
+        """
+        scored: list[tuple[str, float]] = []
+        for asset_id in asset_ids:
+            asset = self._asset_repo.get(asset_id)
+            if asset:
+                score, _ = score_asset(asset)
+                scored.append((asset_id, score))
+            else:
+                scored.append((asset_id, 0.0))
+        # 评分 + 随机噪声后按降序排列
+        scored.sort(
+            key=lambda x: x[1] + random.uniform(0.0, SCORE_RANDOM_NOISE_MAX),
+            reverse=True,
+        )
+        return [aid for aid, _ in scored]
+
    def _fetch_asset_durations(self, asset_ids: List[str]) -> dict[str, float]:
        """从数据库获取素材时长信息.

@@ -3,9 +3,11 @@ import { useQuery } from "@tanstack/react-query"
 import {
  getAssetLibraries,
  getAssets,
+  ensureDefaultLibrary,
  type AssetLibraryItem,
  type AssetItem as ApiAssetItem,
 } from "@/api/assets"
+import { getOrCreateDefaultProject } from "@/api/projects"
 import { mapLibrary, mapAsset, type AssetItem, type LibraryItem } from "../types"

 /**
@@ -16,7 +18,18 @@ export function useAssetsData() {
  /* ── 视频库列表查询 ── */
  const { data: apiLibraries = [], isLoading: libLoading } = useQuery<AssetLibraryItem[], Error>({
    queryKey: ["asset-libraries"],
-    queryFn: getAssetLibraries,
+    queryFn: async () => {
+      const libs = await getAssetLibraries()
+      // 如果没有 video 类型的库，自动创建默认视频素材库（与 useVoiceMaterials 保持一致）
+      const hasVideoLib = libs.some((lib) => lib.kind === "video")
+      if (!hasVideoLib) {
+        const project = await getOrCreateDefaultProject()
+        await ensureDefaultLibrary({ project_id: project.id, kind: "video" })
+        // 创建后重新拉取最新列表
+        return getAssetLibraries()
+      }
+      return libs
+    },
    staleTime: 60_000,
  })

@@ -87,7 +87,6 @@ const TitlePresetsGrid: React.FC<TitlePresetsGridProps> = ({
            key={p.key}
            className={`xx-title-preset-card${isActive ? " active" : ""}`}
            onClick={() => onApply(p.key)}
-            title={p.label}
          >
            <span className="xx-title-preset-preview-text" style={{ position: "relative" }}>
              {/* 底层：描边轮廓 */}
@@ -91,8 +91,6 @@ export const TITLE_PRESETS = [
    style: { size: 32, color: "#d4a843", bold: true, italic: false, stroke: false, shadow: true },
    previewStyle: {
      color: "#d4a843",
-      _strokeColor: "#1a1000",
-      _strokeWidth: 1.5,
      fontWeight: 700,
      fontSize: "32px",
      textShadow: "1px 1px 3px rgba(0,0,0,0.8)",
@@ -104,8 +102,6 @@ export const TITLE_PRESETS = [
    style: { size: 24, color: "#333333", bold: false, italic: false, stroke: false, shadow: false },
    previewStyle: {
      color: "#e8e8e8",
-      _strokeColor: "#cccccc",
-      _strokeWidth: 1,
      fontWeight: 400,
      fontSize: "32px",
    },
@@ -129,8 +125,6 @@ export const TITLE_PRESETS = [
    style: { size: 24, color: "#1a1a1a", bold: false, italic: false, stroke: false, shadow: false },
    previewStyle: {
      color: "#e0e0e0",
-      _strokeColor: "#bbbbbb",
-      _strokeWidth: 1,
      fontWeight: 400,
      fontSize: "32px",
    },
@@ -141,8 +135,6 @@ export const TITLE_PRESETS = [
    style: { size: 28, color: "#e8d5b7", bold: false, italic: false, stroke: false, shadow: true },
    previewStyle: {
      color: "#e8d5b7",
-      _strokeColor: "#3a2a1a",
-      _strokeWidth: 1.5,
      fontWeight: 400,
      fontSize: "32px",
      textShadow: "2px 2px 6px rgba(0,0,0,0.7)",
@@ -154,8 +146,6 @@ export const TITLE_PRESETS = [
    style: { size: 32, color: "#00e5ff", bold: true, italic: false, stroke: false, shadow: true },
    previewStyle: {
      color: "#00e5ff",
-      _strokeColor: "#00e5ff",
-      _strokeWidth: 1,
      fontWeight: 700,
      fontSize: "32px",
      textShadow: "0 0 4px #00e5ff, 0 0 8px #00e5ff, 0 0 16px rgba(0,229,255,0.5)",
@@ -167,13 +157,203 @@ export const TITLE_PRESETS = [
    style: { size: 28, color: "#333333", bold: false, italic: false, stroke: false, shadow: true },
    previewStyle: {
      color: "#e0e0e0",
-      _strokeColor: "#cccccc",
-      _strokeWidth: 1,
      fontWeight: 400,
      fontSize: "32px",
      textShadow: "1px 1px 2px rgba(0,0,0,0.3)",
    },
  },
+  {
+    key: "outline_yellow",
+    label: "黄色描边",
+    style: { size: 28, color: "#ffd54f", bold: true, italic: false, stroke: true, shadow: false },
+    previewStyle: {
+      color: "#ffd54f",
+      _strokeColor: "#000000",
+      _strokeWidth: 2,
+      fontWeight: 700,
+      fontSize: "32px",
+    },
+  },
+  {
+    key: "outline_pink",
+    label: "粉色描边",
+    style: { size: 28, color: "#ff80ab", bold: true, italic: false, stroke: true, shadow: false },
+    previewStyle: {
+      color: "#ff80ab",
+      _strokeColor: "#000000",
+      _strokeWidth: 2,
+      fontWeight: 700,
+      fontSize: "32px",
+    },
+  },
+  {
+    key: "outline_blue",
+    label: "蓝色描边",
+    style: { size: 28, color: "#82b1ff", bold: true, italic: false, stroke: true, shadow: false },
+    previewStyle: {
+      color: "#82b1ff",
+      _strokeColor: "#000000",
+      _strokeWidth: 2,
+      fontWeight: 700,
+      fontSize: "32px",
+    },
+  },
+  {
+    key: "outline_green",
+    label: "绿色描边",
+    style: { size: 28, color: "#69f0ae", bold: true, italic: false, stroke: true, shadow: false },
+    previewStyle: {
+      color: "#69f0ae",
+      _strokeColor: "#000000",
+      _strokeWidth: 2,
+      fontWeight: 700,
+      fontSize: "32px",
+    },
+  },
+  {
+    key: "outline_gray",
+    label: "灰色描边",
+    style: { size: 28, color: "#bdbdbd", bold: true, italic: false, stroke: true, shadow: false },
+    previewStyle: {
+      color: "#bdbdbd",
+      _strokeColor: "#000000",
+      _strokeWidth: 2,
+      fontWeight: 700,
+      fontSize: "32px",
+    },
+  },
+  {
+    key: "bg_white",
+    label: "白底黑字",
+    style: { size: 28, color: "#1a1a1a", bold: true, italic: false, stroke: false, shadow: false },
+    previewStyle: {
+      color: "#1a1a1a",
+      fontWeight: 700,
+      fontSize: "32px",
+      background: "#ffffff",
+      borderRadius: "4px",
+      padding: "2px 6px",
+    },
+  },
+  {
+    key: "bg_yellow",
+    label: "黄底黑字",
+    style: { size: 28, color: "#1a1a1a", bold: true, italic: false, stroke: false, shadow: false },
+    previewStyle: {
+      color: "#1a1a1a",
+      fontWeight: 700,
+      fontSize: "32px",
+      background: "#ffd54f",
+      borderRadius: "4px",
+      padding: "2px 6px",
+    },
+  },
+  {
+    key: "bg_pink",
+    label: "粉底黑字",
+    style: { size: 28, color: "#1a1a1a", bold: true, italic: false, stroke: false, shadow: false },
+    previewStyle: {
+      color: "#1a1a1a",
+      fontWeight: 700,
+      fontSize: "32px",
+      background: "#ff80ab",
+      borderRadius: "4px",
+      padding: "2px 6px",
+    },
+  },
+  {
+    key: "bg_red",
+    label: "红底白字",
+    style: { size: 28, color: "#ffffff", bold: true, italic: false, stroke: false, shadow: false },
+    previewStyle: {
+      color: "#ffffff",
+      fontWeight: 700,
+      fontSize: "32px",
+      background: "#ef5350",
+      borderRadius: "4px",
+      padding: "2px 6px",
+    },
+  },
+  {
+    key: "neon_orange",
+    label: "橙色发光",
+    style: { size: 32, color: "#ff9100", bold: true, italic: false, stroke: false, shadow: true },
+    previewStyle: {
+      color: "#ff9100",
+      fontWeight: 700,
+      fontSize: "32px",
+      textShadow: "0 0 4px #ff9100, 0 0 8px #ff9100, 0 0 16px rgba(255,145,0,0.5)",
+    },
+  },
+  {
+    key: "neon_purple",
+    label: "紫色发光",
+    style: { size: 32, color: "#d500f9", bold: true, italic: false, stroke: false, shadow: true },
+    previewStyle: {
+      color: "#d500f9",
+      fontWeight: 700,
+      fontSize: "32px",
+      textShadow: "0 0 4px #d500f9, 0 0 8px #d500f9, 0 0 16px rgba(213,0,249,0.5)",
+    },
+  },
+  {
+    key: "bordered_white",
+    label: "白字绿框",
+    style: { size: 28, color: "#ffffff", bold: true, italic: false, stroke: false, shadow: false },
+    previewStyle: {
+      color: "#ffffff",
+      fontWeight: 700,
+      fontSize: "32px",
+      background: "#1a1a1a",
+      border: "2px solid #69f0ae",
+      borderRadius: "4px",
+      padding: "2px 6px",
+    },
+  },
+  {
+    key: "gradient_warm",
+    label: "暖色渐变",
+    style: { size: 32, color: "#ff6d00", bold: true, italic: false, stroke: false, shadow: true },
+    previewStyle: {
+      color: "#ff6d00",
+      fontWeight: 700,
+      fontSize: "32px",
+      textShadow: "0 0 6px rgba(255,109,0,0.6), 1px 1px 2px rgba(0,0,0,0.5)",
+    },
+  },
+  {
+    key: "gradient_cool",
+    label: "冷色渐变",
+    style: { size: 32, color: "#00b0ff", bold: true, italic: false, stroke: false, shadow: true },
+    previewStyle: {
+      color: "#00b0ff",
+      fontWeight: 700,
+      fontSize: "32px",
+      textShadow: "0 0 6px rgba(0,176,255,0.6), 1px 1px 2px rgba(0,0,0,0.5)",
+    },
+  },
+  {
+    key: "shadow_deep",
+    label: "深影白字",
+    style: { size: 28, color: "#ffffff", bold: true, italic: false, stroke: false, shadow: true },
+    previewStyle: {
+      color: "#ffffff",
+      fontWeight: 700,
+      fontSize: "32px",
+      textShadow: "2px 2px 4px rgba(0,0,0,0.8), 0 0 8px rgba(0,0,0,0.4)",
+    },
+  },
+  {
+    key: "soft_gold",
+    label: "柔光金",
+    style: { size: 28, color: "#ffd54f", bold: true, italic: false, stroke: false, shadow: true },
+    previewStyle: {
+      color: "#ffd54f",
+      fontWeight: 700,
+      fontSize: "32px",
+      textShadow: "0 0 6px rgba(255,213,79,0.5), 1px 1px 2px rgba(0,0,0,0.4)",
+    },
+  },
 ]

 /* ── 封面模式 ── */
@@ -1733,18 +1733,18 @@
 /* 标题预设卡片网格 */
 .xx-title-presets-grid {
  display: grid;
-  grid-template-columns: repeat(8, 1fr);
-  gap: 1.5px;
+  grid-template-columns: repeat(6, 52px);
+  gap: 1px;
 }

 .xx-title-preset-card {
  display: flex;
  align-items: center;
  justify-content: center;
-  width: 48px;
-  height: 48px;
+  width: 52px;
+  height: 52px;
  padding: 0;
-  background: #3a3a3a;
+  background: #404040;
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
@@ -1753,12 +1753,12 @@

 .xx-title-preset-card:hover {
  border-color: #666;
-  background: #4a4a4a;
+  background: #4d4d4d;
 }

 .xx-title-preset-card.active {
  border-color: #409eff;
-  background: #4a4a4a;
+  background: #4d4d4d;
 }

 .xx-title-preset-preview-text {
@@ -221,7 +221,7 @@ export const ProductCard: React.FC<ProductCardProps> = ({
              product.duplicateRate > 0 ? ` ${dupClass}` : ""
            }`}
          >
-            查重率：{product.duplicateRate > 0 ? `${product.duplicateRate.toFixed(1)}%` : "-"}
+            查重率：{product.duplicateRate != null ? `${product.duplicateRate.toFixed(1)}%` : "-"}
          </span>
        </div>
      </div>
@@ -0,0 +1,216 @@
+# ============================================================
+# 小虾 SaaS — Production 环境配置模板
+# ============================================================
+# 使用方式：复制为 /var/lib/xiaoxia-saas-production/.env 并填入实际密钥
+# 敏感值标记为 ${PLACEHOLDER}，部署前必须替换为真实值
+# ============================================================
+
+
+# ==================== 应用基本配置 ====================
+
+# 应用名称
+APP_NAME=xiaoxia-saas
+
+# 环境标识
+APP_ENV=production
+
+# 关闭 Debug 模式
+DEBUG=false
+
+# 应用基础 URL（前端页面地址）
+APP_BASE_URL=https://xiaoxiajianji.com
+
+# 对外公开的 API 基础 URL（用于生成回调链接等）
+PUBLIC_API_BASE_URL=https://api.xiaoxiajianji.com
+
+# API 服务监听地址
+API_HOST=0.0.0.0
+
+# API 服务监听端口
+API_PORT=8001
+
+# 生产环境关闭自动建表，使用 alembic migration
+AUTO_CREATE_SCHEMA=false
+
+
+# ==================== 数据库配置 ====================
+
+# 数据库连接串（格式：postgresql+psycopg://user:password@host:port/dbname）
+# ${DATABASE_URL} — 替换为实际的 Production PostgreSQL 连接串
+DATABASE_URL=${DATABASE_URL}
+
+# 连接池大小（常驻连接数）
+DATABASE_POOL_SIZE=20
+
+# 连接池最大溢出连接数（pool_size + max_overflow = 最大并发连接数）
+DATABASE_MAX_OVERFLOW=10
+
+# 获取连接超时时间（秒）
+DATABASE_POOL_TIMEOUT=30
+
+# 连接回收时间（秒），防止数据库端主动断开导致的死连接
+DATABASE_POOL_RECYCLE=3600
+
+# 不使用内存数据库
+USE_IN_MEMORY_DB=false
+
+
+# ==================== Redis 配置 ====================
+
+# Redis 连接 URL（格式：redis://[:password@]host:port/db）
+# ${REDIS_URL} — 替换为实际的 Production Redis 连接串
+REDIS_URL=${REDIS_URL}
+
+# 启用 Redis Session 存储（多实例部署必须开启）
+ENABLE_REDIS_SESSIONS=true
+
+
+# ==================== Celery 任务队列 ====================
+
+# Celery Broker（任务分发），使用 Redis db0
+CELERY_BROKER_URL=${CELERY_BROKER_URL}
+
+# Celery Result Backend（任务结果存储），使用 Redis db1
+CELERY_RESULT_BACKEND=${CELERY_RESULT_BACKEND}
+
+
+# ==================== Worker 配置 ====================
+
+# Worker 进程名称
+WORKER_NAME=xiaoxia-saas-worker
+
+# Worker 并发数（同时执行的任务数）
+WORKER_CONCURRENCY=4
+
+# 每个子进程最多处理多少任务后重启（防止内存泄漏）
+WORKER_MAX_TASKS_PER_CHILD=1000
+
+
+# ==================== JWT 认证配置 ====================
+
+# JWT 签名密钥 — 必须设置为强随机字符串（至少32字符）
+# ${JWT_SECRET_KEY} — 替换为实际的随机密钥
+JWT_SECRET_KEY=${JWT_SECRET_KEY}
+
+# JWT 签名算法
+JWT_ALGORITHM=HS256
+
+# Access Token 过期时间（分钟）
+JWT_ACCESS_TOKEN_EXPIRE_MINUTES=30
+
+# Refresh Token 过期时间（天）
+JWT_REFRESH_TOKEN_EXPIRE_DAYS=30
+
+
+# ==================== 邮件配置 ====================
+
+# 邮件功能尚未上线，暂时关闭
+ENABLE_EMAIL_DELIVERY=false
+
+# SMTP 服务器地址
+SMTP_HOST=
+
+# SMTP 端口
+SMTP_PORT=587
+
+# SMTP 用户名（邮件功能上线后配置）
+SMTP_USER=
+
+# SMTP 密码（邮件功能上线后配置）
+SMTP_PASSWORD=
+
+# 发件人邮箱（邮件功能上线后配置）
+SMTP_FROM_EMAIL=
+
+# 发件人显示名称
+SMTP_FROM_NAME=小虾 SaaS
+
+# 启用 TLS
+SMTP_USE_TLS=true
+
+
+# ==================== 阿里云 OSS 配置 ====================
+
+# OSS 区域 endpoint
+OSS_ENDPOINT=oss-cn-hangzhou.aliyuncs.com
+
+# OSS Access Key ID
+# ${OSS_ACCESS_KEY_ID} — 替换为实际的 OSS Access Key ID
+OSS_ACCESS_KEY_ID=${OSS_ACCESS_KEY_ID}
+
+# OSS Access Key Secret
+# ${OSS_ACCESS_KEY_SECRET} — 替换为实际的 OSS Access Key Secret
+OSS_ACCESS_KEY_SECRET=${OSS_ACCESS_KEY_SECRET}
+
+# OSS Bucket 名称
+OSS_BUCKET_NAME=xiaoxia-autocut
+
+# 直传最大文件大小（MB）
+OSS_DIRECT_UPLOAD_MAX_MB=2000
+
+# 直传签名有效期（秒）
+OSS_DIRECT_UPLOAD_EXPIRE_SECONDS=900
+
+
+# ==================== CORS 配置 ====================
+
+# 允许跨域的前端域名列表，逗号分隔
+CORS_ORIGINS_RAW=https://xiaoxiajianji.com,https://api.xiaoxiajianji.com
+
+
+# ==================== 生成文件路径 ====================
+
+# 容器内生成文件目录（固定值，勿改）
+GENERATED_FILES_DIR=/app/generated
+
+# 生成文件 URL 前缀
+GENERATED_FILES_URL_PREFIX=/generated-files
+
+# 主机上生成文件目录（供 Docker volume bind mount 使用）
+GENERATED_FILES_HOST_DIR=/var/lib/xiaoxia-saas-production/generated
+
+
+# ==================== 渲染引擎配置 ====================
+
+# 渲染引擎选择：legacy（旧引擎，稳定）/ unified（新架构）
+RENDER_ENGINE=legacy
+
+
+# ==================== CosyVoice 语音合成 ====================
+
+# 阿里云百灵语音合成服务 API Key
+# ${COSYVOICE_API_KEY} — 替换为实际的 CosyVoice API Key
+COSYVOICE_API_KEY=${COSYVOICE_API_KEY}
+
+# API 基础 URL
+COSYVOICE_BASE_URL=https://dashscope.aliyuncs.com/api/v1
+
+# 模型选择：cosyvoice-v3-flash（推荐）/ cosyvoice-v3-plus
+COSYVOICE_MODEL=cosyvoice-v3-flash
+
+# 音色：v3 系列系统音色带 _v3 后缀
+COSYVOICE_VOICE=longxiaoxia_v3
+
+# 采样率
+COSYVOICE_SAMPLE_RATE=22050
+
+# 输出格式
+COSYVOICE_FORMAT=wav
+
+# 音色克隆模型名（固定值）
+COSYVOICE_CLONE_MODEL=voice-enrollment
+
+# DashScope 通用 API Key（与 CosyVoice 共用）
+DASHSCOPE_API_KEY=${DASHSCOPE_API_KEY}
+
+
+# ==================== MediaKit 视频理解（火山引擎）====================
+
+MEDIAKIT_API_KEY=${MEDIAKIT_API_KEY}
+MEDIAKIT_BASE_URL=https://mediakit.cn-beijing.volces.com/api/v1
+MEDIAKIT_TIMEOUT=60
+
+
+# ==================== 监控（可选）====================
+# Sentry DSN（取消注释并填入实际值以启用错误追踪）
+# SENTRY_DSN=${SENTRY_DSN}
@@ -0,0 +1,233 @@
+# ============================================================
+# 小虾 SaaS — Staging 环境配置模板
+# ============================================================
+# 使用方式：复制为 /var/lib/xiaoxia-saas-staging/.env 并填入实际密钥
+# 敏感值标记为 ${PLACEHOLDER}，部署前必须替换为真实值
+# ============================================================
+
+
+# ==================== 应用基本配置 ====================
+
+# 应用名称
+APP_NAME=xiaoxia-saas
+
+# 环境标识
+APP_ENV=staging
+
+# Staging 开启 Debug 模式便于排查问题
+DEBUG=true
+
+# 应用基础 URL（前端页面地址）
+APP_BASE_URL=https://staging.xiaoxiajianji.com
+
+# 对外公开的 API 基础 URL（用于生成回调链接等）
+PUBLIC_API_BASE_URL=https://staging-api.xiaoxiajianji.com
+
+# API 服务监听地址
+API_HOST=0.0.0.0
+
+# API 服务监听端口
+API_PORT=8000
+
+# 生产/预发布环境关闭自动建表，使用 alembic migration
+AUTO_CREATE_SCHEMA=false
+
+
+# ==================== 数据库配置 ====================
+
+# 数据库连接串（格式：postgresql+psycopg://user:password@host:port/dbname）
+# ${DATABASE_URL} — 替换为实际的 Staging PostgreSQL 连接串
+DATABASE_URL=${DATABASE_URL}
+
+# 连接池大小（常驻连接数）
+DATABASE_POOL_SIZE=20
+
+# 连接池最大溢出连接数（pool_size + max_overflow = 最大并发连接数）
+DATABASE_MAX_OVERFLOW=10
+
+# 获取连接超时时间（秒）
+DATABASE_POOL_TIMEOUT=30
+
+# 连接回收时间（秒），防止数据库端主动断开导致的死连接
+DATABASE_POOL_RECYCLE=3600
+
+# 不使用内存数据库
+USE_IN_MEMORY_DB=false
+
+
+# ==================== Redis 配置 ====================
+
+# Redis 连接 URL（格式：redis://[:password@]host:port/db）
+# ${REDIS_URL} — 替换为实际的 Staging Redis 连接串
+REDIS_URL=${REDIS_URL}
+
+# 启用 Redis Session 存储（多实例部署必须开启）
+ENABLE_REDIS_SESSIONS=true
+
+
+# ==================== Celery 任务队列 ====================
+
+# Celery Broker（任务分发），使用 Redis db0
+CELERY_BROKER_URL=${CELERY_BROKER_URL}
+
+# Celery Result Backend（任务结果存储），使用 Redis db1
+CELERY_RESULT_BACKEND=${CELERY_RESULT_BACKEND}
+
+
+# ==================== Worker 配置 ====================
+
+# Worker 进程名称
+WORKER_NAME=xiaoxia-saas-worker
+
+# Worker 并发数（同时执行的任务数）
+WORKER_CONCURRENCY=1
+
+# 每个子进程最多处理多少任务后重启（防止内存泄漏）
+WORKER_MAX_TASKS_PER_CHILD=1000
+
+
+# ==================== JWT 认证配置 ====================
+
+# JWT 签名密钥 — 必须设置为强随机字符串（至少32字符）
+# ${JWT_SECRET_KEY} — 替换为实际的随机密钥
+JWT_SECRET_KEY=${JWT_SECRET_KEY}
+
+# JWT 签名算法
+JWT_ALGORITHM=HS256
+
+# Access Token 过期时间（分钟）
+JWT_ACCESS_TOKEN_EXPIRE_MINUTES=1440
+
+# Refresh Token 过期时间（天）
+JWT_REFRESH_TOKEN_EXPIRE_DAYS=30
+
+
+# ==================== 邮件配置 ====================
+
+# 邮件功能尚未上线，暂时关闭
+ENABLE_EMAIL_DELIVERY=false
+
+# SMTP 服务器地址
+SMTP_HOST=smtp.gmail.com
+
+# SMTP 端口
+SMTP_PORT=587
+
+# SMTP 用户名（邮件功能上线后配置）
+SMTP_USER=
+
+# SMTP 密码（邮件功能上线后配置）
+SMTP_PASSWORD=
+
+# 发件人邮箱（邮件功能上线后配置）
+SMTP_FROM_EMAIL=
+
+# 发件人显示名称
+SMTP_FROM_NAME=小虾 SaaS
+
+# 启用 TLS
+SMTP_USE_TLS=true
+
+
+# ==================== 阿里云 OSS 配置 ====================
+
+# OSS 区域 endpoint
+OSS_ENDPOINT=oss-cn-hangzhou.aliyuncs.com
+
+# OSS Access Key ID
+# ${OSS_ACCESS_KEY_ID} — 替换为实际的 OSS Access Key ID
+OSS_ACCESS_KEY_ID=${OSS_ACCESS_KEY_ID}
+
+# OSS Access Key Secret
+# ${OSS_ACCESS_KEY_SECRET} — 替换为实际的 OSS Access Key Secret
+OSS_ACCESS_KEY_SECRET=${OSS_ACCESS_KEY_SECRET}
+
+# OSS Bucket 名称
+OSS_BUCKET_NAME=xiaoxia-autocut
+
+# 直传最大文件大小（MB）
+OSS_DIRECT_UPLOAD_MAX_MB=2000
+
+# 直传签名有效期（秒）
+OSS_DIRECT_UPLOAD_EXPIRE_SECONDS=900
+
+
+# ==================== MinIO 配置（Staging 独有）====================
+# Staging 环境使用 MinIO 替代 OSS 进行文件存储测试
+
+# MinIO 服务 Endpoint
+# ${MINIO_ENDPOINT} — 替换为实际的 MinIO 地址
+MINIO_ENDPOINT=${MINIO_ENDPOINT}
+
+# MinIO Access Key
+# ${MINIO_ACCESS_KEY} — 替换为实际的 MinIO Access Key
+MINIO_ACCESS_KEY=${MINIO_ACCESS_KEY}
+
+# MinIO Secret Key
+# ${MINIO_SECRET_KEY} — 替换为实际的 MinIO Secret Key
+MINIO_SECRET_KEY=${MINIO_SECRET_KEY}
+
+# MinIO Bucket 名称
+MINIO_BUCKET_NAME=${MINIO_BUCKET_NAME}
+
+# 是否使用 SSL 连接 MinIO
+MINIO_USE_SSL=false
+
+
+# ==================== CORS 配置 ====================
+
+# 允许跨域的前端域名列表，逗号分隔
+CORS_ORIGINS_RAW=https://staging.xiaoxiajianji.com,https://staging-api.xiaoxiajianji.com
+
+
+# ==================== 生成文件路径 ====================
+
+# 容器内生成文件目录（固定值，勿改）
+GENERATED_FILES_DIR=/app/generated
+
+# 生成文件 URL 前缀
+GENERATED_FILES_URL_PREFIX=/generated-files
+
+# 主机上生成文件目录（供 Docker volume bind mount 使用）
+GENERATED_FILES_HOST_DIR=/var/lib/xiaoxia-saas-staging/generated
+
+
+# ==================== 渲染引擎配置 ====================
+
+# 渲染引擎选择：legacy（旧引擎，稳定）/ unified（新架构）
+RENDER_ENGINE=legacy
+
+
+# ==================== CosyVoice 语音合成 ====================
+
+# 阿里云百灵语音合成服务 API Key
+# ${COSYVOICE_API_KEY} — 替换为实际的 CosyVoice API Key
+COSYVOICE_API_KEY=${COSYVOICE_API_KEY}
+
+# API 基础 URL
+COSYVOICE_BASE_URL=https://dashscope.aliyuncs.com/api/v1
+
+# 模型选择：cosyvoice-v3-flash（推荐）/ cosyvoice-v3-plus
+COSYVOICE_MODEL=cosyvoice-v3-flash
+
+# 音色：v3 系列系统音色带 _v3 后缀
+COSYVOICE_VOICE=longxiaoxia_v3
+
+# 采样率
+COSYVOICE_SAMPLE_RATE=22050
+
+# 输出格式
+COSYVOICE_FORMAT=wav
+
+# 音色克隆模型名（固定值）
+COSYVOICE_CLONE_MODEL=voice-enrollment
+
+# DashScope 通用 API Key（与 CosyVoice 共用）
+DASHSCOPE_API_KEY=${DASHSCOPE_API_KEY}
+
+
+# ==================== MediaKit 视频理解（火山引擎）====================
+
+MEDIAKIT_API_KEY=${MEDIAKIT_API_KEY}
+MEDIAKIT_BASE_URL=https://mediakit.cn-beijing.volces.com/api/v1
+MEDIAKIT_TIMEOUT=60
@@ -0,0 +1,51 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml text/javascript application/javascript application/json application/xml+rss;
+
+    client_max_body_size 800m;
+
+    # SPA routing - index.html 禁止缓存，确保每次获取最新版本
+    location / {
+        try_files $uri /index.html;
+    }
+
+    # API proxy — Production 环境代理到 production API 容器
+    resolver 127.0.0.11 valid=10s;
+    resolver_timeout 5s;
+    location /api/ {
+        proxy_pass http://xiaoxia-api-production:8000/api/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_read_timeout 300s;
+        proxy_send_timeout 300s;
+        proxy_request_buffering off;
+    }
+
+    # Generated files — 通过 alias 映射容器内 /app/generated/ 目录
+    location /generated-files/ {
+        alias /app/generated/;
+    }
+
+    # Assets with legacy fallback — 部署期间兼容旧版缓存的 hash 文件名
+    # 先在当前镜像中找，找不到去 legacy-assets 目录找（从旧版本容器中备份的）
+    location ^~ /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+        try_files $uri /assets-legacy$uri =404;
+    }
+
+    # 静态资源长缓存
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}
@@ -0,0 +1,50 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml text/javascript application/javascript application/json application/xml+rss;
+
+    client_max_body_size 800m;
+
+    # SPA routing - index.html 禁止缓存，确保每次获取最新版本
+    location = /index.html {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+        add_header Pragma "no-cache";
+        expires 0;
+    }
+
+    # SPA fallback
+    location / {
+        try_files $uri /index.html;
+    }
+
+    # API proxy — Staging 环境代理到 staging API 容器
+    resolver 127.0.0.11 valid=10s;
+    resolver_timeout 5s;
+    location /api/ {
+        proxy_pass http://xiaoxia-api-staging:8000/api/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_read_timeout 300s;
+        proxy_send_timeout 300s;
+        proxy_request_buffering off;
+    }
+
+    # Generated files — 通过 alias 映射容器内 /app/generated/ 目录
+    location /generated-files/ {
+        alias /app/generated/;
+    }
+
+    # 静态资源长缓存
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}
@@ -208,7 +208,7 @@ volumes:
      # 重要: 确保主机目录存在且有正确权限
      # Staging: /var/lib/xiaoxia-saas-staging/generated
      # Production: /var/lib/xiaoxia-saas-production/generated
-      device: ${GENERATED_FILES_HOST_DIR:-/var/lib/xiaoxia-saas-staging/generated}
+      device: ${GENERATED_FILES_HOST_DIR:?GENERATED_FILES_HOST_DIR must be set in .env}

 # ===========================================
 # 网络配置
@@ -289,6 +289,7 @@ class GenerationTaskModel(Base):
    completed_at = Column(DateTime, nullable=True)
    created_by_user_id = Column(String(36), nullable=False, default="", index=True)
    source_edit_plan_id = Column(String(36), nullable=True, index=True)
+    edit_plan_id = Column(String(36), nullable=True, index=True)
    asset_select_mode = Column(String(20), nullable=False, default="")
    batch_id = Column(String(36), nullable=False, default="", index=True)
    video_title = Column(String(255), nullable=False, default="")
@@ -497,6 +498,7 @@ class TemplateCategoryModel(Base):
    id = Column(String(36), primary_key=True)
    user_id = Column(String(36), nullable=False, index=True)
    name = Column(String(100), nullable=False)
+    sort_order = Column(Integer, nullable=False, default=0)
    created_at = Column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))


@@ -27,6 +27,137 @@ DEFAULT_INTRO_DURATION = 3.0
 DEFAULT_OUTRO_DURATION = 3.0


+# ── SceneChange 镜头段工具 ────────────────────────────────────────────────────
+
+
+def build_scene_segments(
+    scene_changes: list[float],
+    asset_duration: float,
+) -> list[tuple[float, float]]:
+    """根据场景切换点构建镜头段列表.
+
+    Args:
+        scene_changes: 场景切换点时间戳列表（已排序，首位为 0.0）
+        asset_duration: 素材总时长
+
+    Returns:
+        镜头段列表 [(start, end), ...]，仅保留长度 >= 0.5s 的段
+    """
+    segments: list[tuple[float, float]] = []
+    for i, ts in enumerate(scene_changes):
+        end = scene_changes[i + 1] if i + 1 < len(scene_changes) else asset_duration
+        # 只保留有效长度的镜头段（至少 0.5 秒）
+        if end - ts >= 0.5:
+            segments.append((ts, end))
+    return segments
+
+
+def pick_start_in_scene_segment(
+    seg_start: float,
+    seg_end: float,
+    clip_duration: float,
+) -> float | None:
+    """在镜头段内随机选取一个起始时间点.
+
+    确保 start + clip_duration <= seg_end。
+    若镜头段长度不足以容纳片段，返回 None。
+    """
+    available = seg_end - seg_start - clip_duration
+    if available < 0:
+        return None
+    max_start = seg_start + available
+    return random.uniform(seg_start, max_start)
+
+
+def _segments_overlap(
+    start: float,
+    duration: float,
+    used: list[tuple[float, float]],
+    edge_gap: float = 0.0,
+) -> bool:
+    """候选区间 [start, start+duration] 是否与已用区间冲突（含边缘间隙扩边）。"""
+    end = start + duration
+    for used_start, used_end in used:
+        if start < used_end + edge_gap and end > used_start - edge_gap:
+            return True
+    return False
+
+
+def pick_scene_aware_start(
+    asset_id: str,
+    clip_duration: float,
+    asset_durations: dict[str, float],
+    asset_scene_points: dict[str, list[float]] | None,
+    used_segments: dict[str, list[tuple[float, float]]],
+    *,
+    edge_gap: float = 0.0,
+) -> float | None:
+    """基于缓存的场景切换点，从随机镜头段中选取不冲突的起始时间.
+
+    流程：
+    1. 读取 asset_scene_points 中该素材的场景切换点缓存 → 构建镜头段
+    2. random.shuffle 镜头段（保证同一素材多次生成选不同镜头，而非固定第N段）
+    3. 依次尝试：段内随机取点 → 越界检查 → 与 used_segments 冲突检查
+    4. 全部冲突/无缓存 → 返回 None，由调用方回退 _calc_random_start_time
+
+    Args:
+        asset_id: 素材 ID
+        clip_duration: 片段时长（秒）
+        asset_durations: 素材 ID -> 总时长
+        asset_scene_points: 素材 ID -> 场景切换点列表（metadata 缓存）
+        used_segments: 素材 ID -> 已用区间列表（冲突避让）
+        edge_gap: 冲突判定的边缘间隙（秒），已用区间按 [s-gap, e+gap] 扩边
+    """
+    asset_total = (asset_durations or {}).get(asset_id)
+    if not asset_total or asset_total <= 0:
+        return None
+    scene_points = (asset_scene_points or {}).get(asset_id)
+    if not scene_points:
+        return None
+    used = used_segments.get(asset_id, []) if used_segments else []
+
+    scene_segments = build_scene_segments(scene_points, asset_total)
+    if not scene_segments:
+        return None
+    random.shuffle(scene_segments)
+
+    for seg_start, seg_end in scene_segments:
+        candidate = pick_start_in_scene_segment(seg_start, seg_end, clip_duration)
+        if candidate is None:
+            continue
+        # 越界检查（防御：场景点末尾段理论上不越界，metadata 脏数据兜底）
+        if candidate + clip_duration > asset_total:
+            continue
+        # 与已用区间冲突检查
+        if _segments_overlap(candidate, clip_duration, used, edge_gap):
+            continue
+        return candidate
+
+    return None
+
+
+def extract_scene_points_from_metadata(metadata: object) -> list[float] | None:
+    """从素材 metadata 中提取并校验场景切换点缓存.
+
+    合法缓存：list 类型、至少 2 个数值点、单调非负；否则返回 None（按未缓存处理）。
+    """
+    if not isinstance(metadata, dict):
+        return None
+    points = metadata.get("scene_change_points")
+    if not isinstance(points, list) or len(points) < 2:
+        return None
+    try:
+        cleaned = [float(p) for p in points]
+    except (TypeError, ValueError):
+        return None
+    if any(p < 0 for p in cleaned):
+        return None
+    cleaned = sorted(cleaned)
+    if cleaned[0] != 0.0:
+        cleaned.insert(0, 0.0)
+    return cleaned
+
+
 # ── 素材分配 ────────────────────────────────────────────────────────────────


@@ -37,6 +168,7 @@ def distribute_assets(
    *,
    random_selection: bool = False,
    asset_durations: dict[str, float] | None = None,
+    asset_scene_points: dict[str, list[float]] | None = None,
 ) -> None:
    """按 editing_mode 将素材分配到 clips（就地修改）.

@@ -46,12 +178,16 @@ def distribute_assets(
    - VOICE_OVER: 素材→main clips (B-roll)
    - VOICE_PIP: 第1个→background, 第2个→corner_voice, 其余→b_roll

+    start_time 选取：素材 metadata 中有场景切换点缓存时，优先从随机镜头段
+    取起点（不同片段来自不同镜头）；无缓存或镜头段都冲突时回退随机起点。
+
    Args:
        clips: 剪辑片段列表（就地修改 asset_id）
        asset_ids: 素材 ID 列表
        editing_mode: 剪辑模式字符串
        random_selection: 是否随机选择素材（用于预览生成）
-        asset_durations: 素材 ID -> 时长（秒）映射，用于设置随机 start_time
+        asset_durations: 素材 ID -> 时长（秒）映射，用于设置 start_time
+        asset_scene_points: 素材 ID -> 场景切换点列表（metadata 缓存）
    """
    if not asset_ids or not clips:
        return
@@ -62,22 +198,56 @@ def distribute_assets(
        random.shuffle(asset_ids)

    if editing_mode == EditingMode.ONE_TAKE.value:
-        _distribute_one_take(clips, asset_ids, asset_durations)
+        _distribute_one_take(clips, asset_ids, asset_durations, asset_scene_points)
    elif editing_mode == EditingMode.PIP.value:
-        _distribute_pip(clips, asset_ids, asset_durations)
+        _distribute_pip(clips, asset_ids, asset_durations, asset_scene_points)
    elif editing_mode == EditingMode.VOICE_OVER.value:
-        _distribute_voice_over(clips, asset_ids, asset_durations)
+        _distribute_voice_over(clips, asset_ids, asset_durations, asset_scene_points)
    elif editing_mode == EditingMode.VOICE_PIP.value:
-        _distribute_voice_pip(clips, asset_ids, asset_durations)
+        _distribute_voice_pip(clips, asset_ids, asset_durations, asset_scene_points)
    else:
        # 未知模式，退化为 one_take
-        _distribute_one_take(clips, asset_ids, asset_durations)
+        _distribute_one_take(clips, asset_ids, asset_durations, asset_scene_points)
+
+
+def _resolve_start_time(
+    asset_id: str,
+    clip_duration: float,
+    asset_durations: dict[str, float] | None,
+    used_segments: dict[str, list[tuple[float, float]]],
+    asset_scene_points: dict[str, list[float]] | None = None,
+    on_exhausted: Callable[[str, float], tuple[float, float] | None] | None = None,
+) -> float | None:
+    """选取片段起点：场景缓存优先（随机镜头段），无缓存/全冲突回退随机起点.
+
+    场景路径与随机路径共享 used_segments 冲突避让；场景路径返回 None 时
+    （无缓存、镜头段全冲突）回退 _calc_random_start_time，其受控复用逻辑
+    （on_exhausted）不受影响。
+    """
+    if asset_scene_points and asset_scene_points.get(asset_id):
+        scene_start = pick_scene_aware_start(
+            asset_id,
+            clip_duration,
+            asset_durations or {},
+            asset_scene_points,
+            used_segments,
+        )
+        if scene_start is not None:
+            return scene_start
+    return _calc_random_start_time(
+        asset_id,
+        clip_duration,
+        asset_durations,
+        used_segments,
+        on_exhausted=on_exhausted,
+    )


 def _distribute_one_take(
    clips: List[EditPlanClip],
    asset_ids: List[str],
    asset_durations: dict[str, float] | None = None,
+    asset_scene_points: dict[str, list[float]] | None = None,
 ) -> None:
    """ONE_TAKE: 素材按顺序依次分配给 main 类型 clips."""
    used_segments: dict[str, list[tuple[float, float]]] = {}
@@ -85,7 +255,9 @@ def _distribute_one_take(
    for i, clip in enumerate(main_clips):
        if i < len(asset_ids):
            asset_id = asset_ids[i]
-            start_time = _calc_random_start_time(asset_id, clip.duration, asset_durations, used_segments)
+            start_time = _resolve_start_time(
+                asset_id, clip.duration, asset_durations, used_segments, asset_scene_points
+            )
            clip.assign_asset(asset_id, start_time=start_time)
            # Record used segment
            if start_time is not None and asset_durations is not None:
@@ -98,6 +270,7 @@ def _distribute_pip(
    clips: List[EditPlanClip],
    asset_ids: List[str],
    asset_durations: dict[str, float] | None = None,
+    asset_scene_points: dict[str, list[float]] | None = None,
 ) -> None:
    """PIP: 第1个素材→main(全屏背景)，其余→overlay clips."""
    used_segments: dict[str, list[tuple[float, float]]] = {}
@@ -105,7 +278,9 @@ def _distribute_pip(
    main_clips = [c for c in clips if c.clip_type == ClipType.MAIN.value]
    if main_clips and asset_ids:
        asset_id = asset_ids[0]
-        start_time = _calc_random_start_time(asset_id, main_clips[0].duration, asset_durations, used_segments)
+        start_time = _resolve_start_time(
+            asset_id, main_clips[0].duration, asset_durations, used_segments, asset_scene_points
+        )
        main_clips[0].assign_asset(asset_id, start_time=start_time)
        # Record used segment
        if start_time is not None and asset_durations is not None:
@@ -119,7 +294,9 @@ def _distribute_pip(
    for i, clip in enumerate(overlay_clips):
        if i < len(remaining):
            asset_id = remaining[i]
-            start_time = _calc_random_start_time(asset_id, clip.duration, asset_durations, used_segments)
+            start_time = _resolve_start_time(
+                asset_id, clip.duration, asset_durations, used_segments, asset_scene_points
+            )
            clip.assign_asset(asset_id, start_time=start_time)
            # Record used segment
            if start_time is not None and asset_durations is not None:
@@ -132,6 +309,7 @@ def _distribute_voice_over(
    clips: List[EditPlanClip],
    asset_ids: List[str],
    asset_durations: dict[str, float] | None = None,
+    asset_scene_points: dict[str, list[float]] | None = None,
 ) -> None:
    """VOICE_OVER: 素材→main clips (B-roll)."""
    used_segments: dict[str, list[tuple[float, float]]] = {}
@@ -139,7 +317,9 @@ def _distribute_voice_over(
    for i, clip in enumerate(main_clips):
        if i < len(asset_ids):
            asset_id = asset_ids[i]
-            start_time = _calc_random_start_time(asset_id, clip.duration, asset_durations, used_segments)
+            start_time = _resolve_start_time(
+                asset_id, clip.duration, asset_durations, used_segments, asset_scene_points
+            )
            clip.assign_asset(asset_id, start_time=start_time)
            # Record used segment
            if start_time is not None and asset_durations is not None:
@@ -152,6 +332,7 @@ def _distribute_voice_pip(
    clips: List[EditPlanClip],
    asset_ids: List[str],
    asset_durations: dict[str, float] | None = None,
+    asset_scene_points: dict[str, list[float]] | None = None,
 ) -> None:
    """VOICE_PIP: 第1个→background, 第2个→corner_voice, 其余→b_roll."""
    used_segments: dict[str, list[tuple[float, float]]] = {}
@@ -164,7 +345,9 @@ def _distribute_voice_pip(
    # 第1个 → background
    if idx < len(asset_ids) and bg_clips:
        asset_id = asset_ids[idx]
-        start_time = _calc_random_start_time(asset_id, bg_clips[0].duration, asset_durations, used_segments)
+        start_time = _resolve_start_time(
+            asset_id, bg_clips[0].duration, asset_durations, used_segments, asset_scene_points
+        )
        bg_clips[0].assign_asset(asset_id, start_time=start_time)
        # Record used segment
        if start_time is not None and asset_durations is not None:
@@ -176,7 +359,9 @@ def _distribute_voice_pip(
    # 第2个 → corner_voice
    if idx < len(asset_ids) and voice_clips:
        asset_id = asset_ids[idx]
-        start_time = _calc_random_start_time(asset_id, voice_clips[0].duration, asset_durations, used_segments)
+        start_time = _resolve_start_time(
+            asset_id, voice_clips[0].duration, asset_durations, used_segments, asset_scene_points
+        )
        voice_clips[0].assign_asset(asset_id, start_time=start_time)
        # Record used segment
        if start_time is not None and asset_durations is not None:
@@ -190,7 +375,9 @@ def _distribute_voice_pip(
    for i, clip in enumerate(broll_clips):
        if i < len(remaining):
            asset_id = remaining[i]
-            start_time = _calc_random_start_time(asset_id, clip.duration, asset_durations, used_segments)
+            start_time = _resolve_start_time(
+                asset_id, clip.duration, asset_durations, used_segments, asset_scene_points
+            )
            clip.assign_asset(asset_id, start_time=start_time)
            # Record used segment
            if start_time is not None and asset_durations is not None:
@@ -14,6 +14,13 @@ from dataclasses import dataclass, field
 from datetime import datetime, timezone
 from typing import Any

+# 素材选取排序时注入的随机噪声上限（分）。
+# score_asset 综合得分范围为 0-100，噪声 0~20 意味着：
+# - 素材间得分差距 > 20 分时，排名不受影响（质量差异显著的素材保持稳定优先级）
+# - 得分接近（差距 <= 20 分）的素材排名会随机浮动，使每次生成选出的素材组合不同，
+#   从素材组合层面降低成片重复率；排名靠后的低分素材也有机会入选。
+SCORE_RANDOM_NOISE_MAX = 20.0
+

@dataclass
 class SmartMatchResult:
@@ -119,6 +119,70 @@ class MediaKitClient:

        return None

+    def detect_scene_changes(
+        self,
+        video_url: str,
+        max_frames: int = 20,
+        poll_interval: float = 2.0,
+        max_poll_attempts: int = 30,
+    ) -> Optional[List[float]]:
+        """检测视频场景切换点，返回时间戳列表.
+
+        降级策略：
+        1. 先尝试 SceneChange 策略
+        2. SceneChange 失败（OOM等）→ 退回 TimeInterval（5秒间隔）
+        3. MediaKit 不可用 → 返回 None
+
+        Returns:
+            场景切换点时间戳列表，如 [0.0, 3.2, 7.8, 12.5]
+            失败返回 None
+        """
+        if not self.is_available:
+            logger.warning("MediaKit 未配置，跳过场景检测")
+            return None
+
+        # 策略1：尝试 SceneChange
+        frames = self.extract_frames(
+            video_url=video_url,
+            strategy="SceneChange",
+            max_frames=max_frames,
+            poll_interval=poll_interval,
+            max_poll_attempts=max_poll_attempts,
+        )
+
+        # 策略2：SceneChange 失败 → 退回 TimeInterval（5秒间隔）
+        if frames is None:
+            logger.info("SceneChange 策略失败，降级为 TimeInterval（5秒间隔）")
+            # 估算帧数：假设视频最长60秒，每5秒一帧
+            ti_max_frames = max(max_frames, 12)
+            frames = self.extract_frames(
+                video_url=video_url,
+                strategy="TimeInterval",
+                max_frames=ti_max_frames,
+                poll_interval=poll_interval,
+                max_poll_attempts=max_poll_attempts,
+            )
+
+        if frames is None:
+            return None
+
+        # 从帧列表中提取 timestamp，排序
+        timestamps = sorted({float(f.get("timestamp", 0.0)) for f in frames if "timestamp" in f})
+
+        if not timestamps:
+            return None
+
+        # 始终在列表开头加 0.0（素材起始点）
+        if timestamps[0] != 0.0:
+            timestamps.insert(0, 0.0)
+
+        logger.info(
+            "场景检测完成: video_url=%s scene_changes=%s",
+            video_url[:80],
+            timestamps,
+        )
+        return timestamps
+
    def _submit_extract_task(
        self,
        video_url: str,
@@ -24,8 +24,10 @@ celery==5.4.0
 # 对象存储
 oss2==2.18.4

-# HTTP 客户端
+# HTTP 客户端（pin 间接依赖防止版本漂移）
 httpx==0.27.2
+httpcore==1.0.7
+h2==4.1.0

 # Prometheus monitoring
 prometheus-client==0.21.1
@@ -15,5 +15,6 @@ pytest-xdist==3.6.1
 diff-cover==8.0.3

 # 资产质量评分依赖（与 requirements-worker.txt 保持一致）
+numpy==1.26.4
 scipy==1.13.1
 Pillow==10.4.0
@@ -1,77 +1,136 @@
 #!/bin/bash
 # CI Unit Tests Job 主脚本
-# 包含：依赖安装、增量测试选择、覆盖率测试、diff覆盖率门禁
+# 包含：依赖缓存、增量测试选择、覆盖率测试、diff覆盖率门禁
 set -eu

 JOB_NAME="${1:-Unit Tests}"

 echo "=== CI Unit Tests 开始 ==="

+# --- 依赖缓存检查 ---
+# 如果 requirements 文件未变化且依赖已安装，跳过 pip install（持久 runner 优化）
+REQ_HASH_FILE="/tmp/.ci_unit_tests_req_hash"
+CURRENT_REQ_HASH=""
+if [ -f requirements-base.txt ] && [ -f requirements.txt ] && [ -f requirements-dev.txt ]; then
+  CURRENT_REQ_HASH=$(cat requirements-base.txt requirements.txt requirements-dev.txt | md5sum | cut -d' ' -f1)
+fi
+
+SKIP_PIP_INSTALL=false
+if [ -n "$CURRENT_REQ_HASH" ] && [ -f "$REQ_HASH_FILE" ]; then
+  CACHED_HASH=$(cat "$REQ_HASH_FILE")
+  if [ "$CACHED_HASH" = "$CURRENT_REQ_HASH" ]; then
+    # 验证关键包是否还在
+    if python3 -c "import pytest; import celery" 2>/dev/null; then
+      echo "✅ 依赖无变化 (hash=$CURRENT_REQ_HASH)，跳过 pip install"
+      SKIP_PIP_INSTALL=true
+    else
+      echo "⚠️ 依赖 hash 匹配但关键包缺失，重新安装"
+    fi
+  fi
+fi
+
 # --- 安装依赖 ---
-echo ""
-echo "=== 安装 Python 依赖 ==="
-# pip install 带重试（网络不稳定时自动重试）
-for i in 1 2 3; do
-  python3 -m pip install -q -r requirements-base.txt && break
-  echo "pip install requirements-base.txt 失败，重试 $i/3..."
-  [ $i -eq 3 ] && exit 1
-  sleep 5
-done
-for i in 1 2 3; do
-  python3 -m pip install -q -r requirements.txt && break
-  echo "pip install requirements.txt 失败，重试 $i/3..."
-  [ $i -eq 3 ] && exit 1
-  sleep 5
-done
-for i in 1 2 3; do
-  python3 -m pip install -q -r requirements-dev.txt && break
-  echo "pip install requirements-dev.txt 失败，重试 $i/3..."
-  [ $i -eq 3 ] && exit 1
-  sleep 5
-done
+if [ "$SKIP_PIP_INSTALL" = "false" ]; then
+  echo ""
+  echo "=== 安装 Python 依赖 ==="
+  # pip install 带重试（网络不稳定时自动重试），合并为一次调用减少开销
+  for i in 1 2 3; do
+    python3 -m pip install -q -r requirements-base.txt -r requirements.txt -r requirements-dev.txt && break
+    echo "pip install 失败，重试 $i/3..."
+    [ $i -eq 3 ] && exit 1
+    sleep 5
+  done
+  # 保存 hash 标记
+  if [ -n "$CURRENT_REQ_HASH" ]; then
+    echo "$CURRENT_REQ_HASH" > "$REQ_HASH_FILE"
+  fi
+fi
 pytest --version

 # 双保险：确保numpy已安装
 echo "=== 验证 numpy 安装 ==="
 SKIP_NUMPY_TESTS=0
-python3 -m pip install numpy==1.26.4 || {
-  echo "❌ numpy 首次安装失败，尝试不使用缓存重新安装..."
-  python3 -m pip install --no-cache-dir numpy==1.26.4 || {
-    echo "⚠️ numpy 安装失败，跳过需要 numpy 的测试"
-    SKIP_NUMPY_TESTS=1
+if python3 -c "import numpy; assert numpy.__version__ == '1.26.4'" 2>/dev/null; then
+  echo "✅ numpy 1.26.4 已就绪（缓存命中）"
+else
+  echo "需要安装 numpy 1.26.4..."
+  python3 -m pip install numpy==1.26.4 || {
+    echo "❌ numpy 首次安装失败，尝试不使用缓存重新安装..."
+    python3 -m pip install --no-cache-dir numpy==1.26.4 || {
+      echo "⚠️ numpy 安装失败，跳过需要 numpy 的测试"
+      SKIP_NUMPY_TESTS=1
+    }
  }
-}
+fi
 if [ "$SKIP_NUMPY_TESTS" = "0" ]; then
-  python3 -c "import numpy; print(f'✅ numpy {numpy.__version__} 安装成功')" || {
+  python3 -c "import numpy; print(f'✅ numpy {numpy.__version__} 就绪')" || {
    echo "⚠️ numpy 导入失败，跳过需要 numpy 的测试"
    SKIP_NUMPY_TESTS=1
  }
 fi

-# --- 增量测试选择（仅PR） ---
+# --- 增量测试选择（PR + push 均支持） ---
 UNIT_TEST_MODE="full"
 SELECTED_TEST_FILES="tests/unit"

-if [ "${GITHUB_EVENT_NAME:-}" = "pull_request" ] && [ -n "${GITHUB_TOKEN:-}" ]; then
+IS_PULL_REQUEST=false
+IS_PUSH=false
+[ "${GITHUB_EVENT_NAME:-}" = "pull_request" ] && IS_PULL_REQUEST=true
+[ "${GITHUB_EVENT_NAME:-}" = "push" ] && IS_PUSH=true
+
+if ($IS_PULL_REQUEST || $IS_PUSH) && [ -n "${GITHUB_TOKEN:-}" ]; then
  echo ""
  echo "=== 增量测试选择 ==="
-  PR_NUMBER=$(echo "$GITHUB_REF" | sed 's|refs/pull/||; s|/.*||')
-  API_URL="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/pulls/${PR_NUMBER}/files?limit=300"
-  CHANGED_FILES=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" "$API_URL" | python3 -c "import sys,json; [print(f['filename']) for f in json.load(sys.stdin) if f['status'] != 'removed']")
+
+  CHANGED_FILES=""
+
+  if $IS_PULL_REQUEST; then
+    PR_NUMBER=$(echo "$GITHUB_REF" | sed 's|refs/pull/||; s|/.*||')
+    API_URL="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/pulls/${PR_NUMBER}/files?limit=300"
+    CHANGED_FILES=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" "$API_URL" \
+      | python3 -c "import sys,json; [print(f['filename']) for f in json.load(sys.stdin) if f['status'] != 'removed']")
+  elif $IS_PUSH && [ -n "${GITHUB_SHA:-}" ]; then
+    # Push 事件：通过 GitHub API 获取本次 push 改动的文件
+    API_URL="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/commits/${GITHUB_SHA}"
+    RESPONSE=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" \
+      -H "Accept: application/vnd.github.v3.diff" "$API_URL" 2>/dev/null || echo "")
+
+    if [ -n "$RESPONSE" ]; then
+      CHANGED_FILES=$(echo "$RESPONSE" | grep '^diff --git' | sed 's|diff --git a/\(.*\) b/.*|\1|' || echo "")
+    fi
+
+    # 备用方案：获取 previous commit SHA 再查 API
+    if [ -z "$CHANGED_FILES" ]; then
+      PREV_SHA=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" \
+        "${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/commits?sha=${GITHUB_SHA}&per_page=2" \
+        | python3 -c "import sys,json; commits=json.load(sys.stdin); print(commits[1]['sha'] if len(commits)>1 else '')" 2>/dev/null || echo "")
+      if [ -n "$PREV_SHA" ]; then
+        COMPARE_URL="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/compare/${PREV_SHA}...${GITHUB_SHA}"
+        CHANGED_FILES=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" "$COMPARE_URL" \
+          | python3 -c "import sys,json; data=json.load(sys.stdin); [print(f['filename']) for f in data.get('files',[]) if f['status'] != 'removed']" 2>/dev/null || echo "")
+      fi
+    fi
+  fi
+
  echo "改动文件数: $(echo "$CHANGED_FILES" | grep -c . || echo 0)"
-  set +e
-  CHANGED_FILES="$CHANGED_FILES" \
-  SELECTED_TESTS_OUTPUT=/tmp/selected_tests.txt \
-  python3 scripts/ci/select_unit_tests.py
-  SELECT_EXIT=$?
-  set -e
-  if [ $SELECT_EXIT -eq 0 ]; then
-    UNIT_TEST_MODE="incremental"
-    TEST_FILES=$(cat /tmp/selected_tests.txt | tr '\n' ' ')
-    SELECTED_TEST_FILES="$TEST_FILES"
-    echo "增量模式: $(cat /tmp/selected_tests.txt | wc -l) 个测试文件"
+
+  if [ -n "$CHANGED_FILES" ]; then
+    set +e
+    CHANGED_FILES="$CHANGED_FILES" \
+    SELECTED_TESTS_OUTPUT=/tmp/selected_tests.txt \
+    python3 scripts/ci/select_unit_tests.py
+    SELECT_EXIT=$?
+    set -e
+    if [ $SELECT_EXIT -eq 0 ]; then
+      UNIT_TEST_MODE="incremental"
+      TEST_FILES=$(cat /tmp/selected_tests.txt | tr '\n' ' ')
+      SELECTED_TEST_FILES="$TEST_FILES"
+      echo "增量模式: $(cat /tmp/selected_tests.txt | wc -l) 个测试文件"
+    else
+      echo "全量模式（增量选择失败）"
+    fi
  else
-    echo "全量模式"
+    echo "无法获取改动文件列表，使用全量模式"
  fi
 fi

@@ -116,7 +175,7 @@ if [ "${GITHUB_EVENT_NAME:-}" = "pull_request" ] && [ -n "${GITHUB_TOKEN:-}" ];

  PR_CODE_DIR="/tmp/pr-code-$$"
  mkdir -p "$PR_CODE_DIR"
-  # 备份PR代码（含coverage.xml，diff-cover需要用到
+  # 备份PR代码（含coverage.xml，diff-cover需要用到）
  find . -maxdepth 1 -mindepth 1 ! -name 'diff_coverage.html' -exec cp -r {} "$PR_CODE_DIR/" \;
  rm -rf .git
  git init > /dev/null 2>&1
@@ -55,7 +55,13 @@ if [ -z "$IMAGE_TAG" ]; then
  exit 1
 fi

-test -f "$ENV_FILE"
+# .env 文件由 CI 从模板 + Secrets 渲染后通过 SCP 上传到服务器
+# 如果文件不存在，说明 CI 渲染步骤失败或未执行
+if [ ! -f "$ENV_FILE" ]; then
+  echo "ERROR: $ENV_FILE 不存在。CI 应先在 render_env 步骤渲染并上传此文件"
+  exit 1
+fi
+echo "✅ .env file found: $ENV_FILE ($(wc -l < "$ENV_FILE") lines)"
 mkdir -p "$GENERATED_DIR"
 mkdir -p "$LEGACY_ASSETS_DIR"

@@ -397,7 +403,7 @@ fi
 echo "Stopping old containers..."
 # 优雅关闭：先 stop（发 SIGTERM，等待），再 rm
 # Worker 需要更长时间（视频任务最长可能5分钟）
-docker stop -t 300 xiaoxia-worker-staging 2>/dev/null || true
+docker stop -t 120 xiaoxia-worker-staging 2>/dev/null || true
 docker stop -t 30 xiaoxia-api-staging 2>/dev/null || true
 docker stop -t 10 xiaoxia-web-staging 2>/dev/null || true
 docker rm xiaoxia-worker-staging xiaoxia-api-staging xiaoxia-web-staging 2>/dev/null || true
@@ -187,7 +187,7 @@ health_check() {
            return 0
        fi

-        sleep 5
+        sleep 3
    done

    # 超时了
@@ -0,0 +1,177 @@
+#!/usr/bin/env bash
+# ===========================================================
+# config_diff_check.sh — 对比渲染 .env 与服务器当前 .env
+# ===========================================================
+# 用法: scripts/config_diff_check.sh <rendered_file> <current_file>
+#
+# 输出:
+#   + ADDED   渲染文件有、当前文件没有（新增配置）
+#   - REMOVED 当前文件有、渲染文件没有（将被删除）
+#   ~ CHANGED 两边都有但值不同（将被覆盖）
+#
+# 敏感值脱敏：KEY/SECRET/PASSWORD/TOKEN/URL 类变量只显示前4字符+***
+# 退出码: 始终返回 0（仅告警，不阻塞部署）
+# ===========================================================
+set -u
+
+RENDERED_FILE="${1:-}"
+CURRENT_FILE="${2:-}"
+
+if [ -z "$RENDERED_FILE" ] || [ -z "$CURRENT_FILE" ]; then
+  echo "ERROR: 用法: $0 <rendered_file> <current_file>" >&2
+  exit 0
+fi
+
+if [ ! -f "$RENDERED_FILE" ]; then
+  echo "ERROR: 渲染文件不存在: $RENDERED_FILE" >&2
+  exit 0
+fi
+
+# 判断是否为敏感变量（键名包含以下关键词）
+is_sensitive() {
+  local key="$1"
+  case "$key" in
+    *KEY*|*SECRET*|*PASSWORD*|*TOKEN*|*URL*|*BROKER*|*BACKEND*) return 0 ;;
+    *) return 1 ;;
+  esac
+}
+
+# 脱敏：敏感值只显示前4字符+***
+mask_value() {
+  local key="$1"
+  local value="$2"
+  if is_sensitive "$key"; then
+    if [ ${#value} -le 4 ]; then
+      echo "****"
+    else
+      echo "${value:0:4}***"
+    fi
+  else
+    echo "$value"
+  fi
+}
+
+# 解析文件为 KEY=VALUE（忽略注释和空行）
+parse_env() {
+  local file="$1"
+  grep -vE '^\s*#|^\s*$' "$file" 2>/dev/null | while IFS= read -r line; do
+    # 只取第一个 = 之前的部分作为 key
+    key="${line%%=*}"
+    value="${line#*=}"
+    # 跳过无效行
+    if [ -n "$key" ] && [ "$key" != "$line" ]; then
+      echo "${key}=${value}"
+    fi
+  done
+}
+
+echo "=========================================="
+echo "  配置 Diff 检查（检测配置漂移）"
+echo "=========================================="
+echo "渲染文件: $RENDERED_FILE"
+echo "当前文件: $CURRENT_FILE"
+echo ""
+
+# 解析两个文件
+if [ ! -f "$CURRENT_FILE" ] || [ ! -s "$CURRENT_FILE" ]; then
+  # 服务器 .env 不存在或为空（首次部署）
+  echo "⚠️  服务器 .env 不存在或为空（可能是首次部署）"
+  echo "   所有配置项将标记为 ADDED"
+  echo ""
+
+  added=0
+  while IFS='=' read -r key value; do
+    [ -z "$key" ] && continue
+    masked=$(mask_value "$key" "$value")
+    echo "  + ADDED  ${key}=${masked}"
+    added=$((added + 1))
+  done < <(parse_env "$RENDERED_FILE")
+
+  echo ""
+  echo "=========================================="
+  echo "  汇总: 新增 ${added} 项 | 删除 0 项 | 变更 0 项 | 无变化 0 项"
+  echo "=========================================="
+  exit 0
+fi
+
+# 用临时文件存储解析结果
+tmp_rendered=$(mktemp)
+tmp_current=$(mktemp)
+trap "rm -f $tmp_rendered $tmp_current" EXIT
+
+parse_env "$RENDERED_FILE" | sort > "$tmp_rendered"
+parse_env "$CURRENT_FILE" | sort > "$tmp_current"
+
+added=0
+removed=0
+changed=0
+unchanged=0
+
+echo "--- 新增配置（渲染文件有、当前文件无）---"
+# 找 ADDED：渲染文件有但当前文件没有的 key
+while IFS='=' read -r key value; do
+  [ -z "$key" ] && continue
+  current_line=$(grep -m1 "^${key}=" "$tmp_current" 2>/dev/null || true)
+  if [ -z "$current_line" ]; then
+    masked=$(mask_value "$key" "$value")
+    echo "  + ADDED  ${key}=${masked}"
+    added=$((added + 1))
+  fi
+done < "$tmp_rendered"
+
+if [ "$added" -eq 0 ]; then
+  echo "  (无)"
+fi
+
+echo ""
+echo "--- 删除配置（当前文件有、渲染文件无）---"
+# 找 REMOVED：当前文件有但渲染文件没有的 key
+while IFS='=' read -r key value; do
+  [ -z "$key" ] && continue
+  rendered_line=$(grep -m1 "^${key}=" "$tmp_rendered" 2>/dev/null || true)
+  if [ -z "$rendered_line" ]; then
+    masked=$(mask_value "$key" "$value")
+    echo "  - REMOVED  ${key}=${masked}"
+    removed=$((removed + 1))
+  fi
+done < "$tmp_current"
+
+if [ "$removed" -eq 0 ]; then
+  echo "  (无)"
+fi
+
+echo ""
+echo "--- 变更配置（两边都有但值不同）---"
+# 找 CHANGED：两边都有但值不同
+while IFS='=' read -r key value; do
+  [ -z "$key" ] && continue
+  current_line=$(grep -m1 "^${key}=" "$tmp_current" 2>/dev/null || true)
+  if [ -n "$current_line" ]; then
+    current_value="${current_line#*=}"
+    if [ "$value" != "$current_value" ]; then
+      masked_new=$(mask_value "$key" "$value")
+      masked_old=$(mask_value "$key" "$current_value")
+      echo "  ~ CHANGED  ${key}: ${masked_old} → ${masked_new}"
+      changed=$((changed + 1))
+    else
+      unchanged=$((unchanged + 1))
+    fi
+  fi
+done < "$tmp_rendered"
+
+if [ "$changed" -eq 0 ]; then
+  echo "  (无)"
+fi
+
+echo ""
+echo "=========================================="
+echo "  汇总: 新增 ${added} 项 | 删除 ${removed} 项 | 变更 ${changed} 项 | 无变化 ${unchanged} 项"
+echo "=========================================="
+
+if [ "$added" -gt 0 ] || [ "$removed" -gt 0 ] || [ "$changed" -gt 0 ]; then
+  echo "⚠️  检测到配置漂移，请确认以上变更是否符合预期"
+else
+  echo "✅ 配置无漂移，与服务器当前配置一致"
+fi
+
+exit 0
@@ -0,0 +1,142 @@
+#!/usr/bin/env bash
+# ===========================================================
+# render_env.sh — 从模板 + Secrets 渲染 .env 文件
+# ===========================================================
+# 用法: scripts/render_env.sh <staging|production>
+#
+# 输入: deploy/configs/.env.staging 或 .env.production 模板
+# 输出: .env.rendered（包含真实密钥，切勿提交或打印）
+#
+# 环境变量映射规则:
+#   STAGING_xxx / PRODUCTION_xxx → xxx（去掉环境前缀）
+#   共用 secrets 直接使用（如 OSS_ACCESS_KEY_ID）
+# ===========================================================
+set -eu
+
+TARGET_ENV="${1:-}"
+
+if [ -z "$TARGET_ENV" ] || { [ "$TARGET_ENV" != "staging" ] && [ "$TARGET_ENV" != "production" ]; }; then
+  echo "ERROR: 用法: $0 <staging|production>" >&2
+  exit 1
+fi
+
+TEMPLATE_FILE="deploy/configs/.env.${TARGET_ENV}"
+OUTPUT_FILE=".env.rendered"
+
+if [ ! -f "$TEMPLATE_FILE" ]; then
+  echo "ERROR: 模板文件不存在: $TEMPLATE_FILE" >&2
+  exit 1
+fi
+
+# 构建环境变量映射（带环境前缀的 secrets → 模板变量名）
+ENV_PREFIX=$(echo "$TARGET_ENV" | tr '[:lower:]' '[:upper:]')
+
+# 需要映射的带环境前缀变量
+MAPPED_VARS="DATABASE_URL REDIS_URL CELERY_BROKER_URL CELERY_RESULT_BACKEND JWT_SECRET_KEY"
+
+# Staging 独有的 MinIO 变量
+if [ "$TARGET_ENV" = "staging" ]; then
+  MAPPED_VARS="$MAPPED_VARS MINIO_ENDPOINT MINIO_ACCESS_KEY MINIO_SECRET_KEY"
+fi
+
+# 将带前缀的 secrets 导出为无前缀的环境变量
+for var in $MAPPED_VARS; do
+  prefixed_var="${ENV_PREFIX}_${var}"
+  value="${!prefixed_var:-}"
+  if [ -n "$value" ]; then
+    export "$var=$value"
+  fi
+done
+
+# 特殊映射：CI secret 名称与模板占位符不一致的变量
+# STAGING_MINIO_BUCKET → MINIO_BUCKET_NAME
+if [ "$TARGET_ENV" = "staging" ]; then
+  if [ -n "${STAGING_MINIO_BUCKET:-}" ]; then
+    export "MINIO_BUCKET_NAME=$STAGING_MINIO_BUCKET"
+  fi
+fi
+
+# 共用 secrets 直接导出（如果存在）
+SHARED_SECRETS="OSS_ACCESS_KEY_ID OSS_ACCESS_KEY_SECRET COSYVOICE_API_KEY DASHSCOPE_API_KEY MEDIAKIT_API_KEY"
+for var in $SHARED_SECRETS; do
+  value="${!var:-}"
+  # 已经在环境中了，无需额外操作
+done
+
+# 使用 Python 进行变量替换（Python 在 CI runner 中一定存在）
+python3 - "$TEMPLATE_FILE" "$OUTPUT_FILE" "$ENV_PREFIX" "$MAPPED_VARS" "$SHARED_SECRETS" <<'PYTHON_SCRIPT'
+import sys
+import os
+import re
+
+template_file = sys.argv[1]
+output_file = sys.argv[2]
+env_prefix = sys.argv[3]
+mapped_vars_str = sys.argv[4]
+shared_secrets_str = sys.argv[5]
+
+# 收集所有可用的替换变量
+all_vars = set()
+for v in mapped_vars_str.split():
+    all_vars.add(v)
+for v in shared_secrets_str.split():
+    all_vars.add(v)
+
+# 读取模板
+with open(template_file, 'r') as f:
+    template = f.read()
+
+# 找出模板中所有的 ${VAR} 占位符（仅检查非注释行）
+pattern = re.compile(r'\$\{(\w+)\}')
+placeholders = set()
+for line in template.splitlines():
+    stripped = line.strip()
+    if stripped.startswith('#'):
+        continue
+    placeholders.update(pattern.findall(line))
+
+# 检查必需变量是否已设置
+missing = []
+for var in placeholders:
+    value = os.environ.get(var, '')
+    if not value:
+        missing.append(var)
+
+if missing:
+    print(f"ERROR: 以下变量未设置或为空: {', '.join(sorted(missing))}", file=sys.stderr)
+    print(f"请确认对应的 {env_prefix}_xxx 或共用 secrets 已在 Gitea Secrets 中配置", file=sys.stderr)
+    sys.exit(1)
+
+# 执行替换
+def replace_var(match):
+    var_name = match.group(1)
+    return os.environ.get(var_name, match.group(0))
+
+rendered = pattern.sub(replace_var, template)
+
+# 写入输出文件
+with open(output_file, 'w') as f:
+    f.write(rendered)
+
+# 设置文件权限为仅 owner 可读写
+os.chmod(output_file, 0o600)
+
+print(f"✅ .env 渲染完成: {template_file} → {output_file}")
+print(f"   替换了 {len(placeholders)} 个变量")
+PYTHON_SCRIPT
+
+# 验证输出文件
+if [ ! -f "$OUTPUT_FILE" ]; then
+  echo "ERROR: 渲染失败，输出文件不存在" >&2
+  exit 1
+fi
+
+# 检查输出文件中是否还有未替换的占位符（仅检查非注释行）
+if grep -vE '^\s*#' "$OUTPUT_FILE" | grep -qE '\$\{[A-Z_]+\}'; then
+  echo "ERROR: 输出文件中仍有未替换的占位符:" >&2
+  grep -nE '\$\{[A-Z_]+\}' "$OUTPUT_FILE" | grep -v '^\s*#' >&2
+  exit 1
+fi
+
+echo "✅ 渲染文件校验通过，无残留占位符"
+echo "⚠️  $OUTPUT_FILE 包含敏感信息，请勿提交或打印到日志"
@@ -38,6 +38,28 @@ def _segments(count: int, dur_min: float = 3.0, dur_max: float = 5.0):
    return [(i, dur_min, dur_max) for i in range(count)]


+def _patch_zero_noise():
+    """消除 clips.py 排序随机噪声，用于确定性断言（如均衡分配）。
+
+    排序噪声（random.uniform(0, SCORE_RANDOM_NOISE_MAX)）返回 0；
+    其他 uniform 调用（片段时长随机）委托给独立 Random 实例，行为不变。
+    """
+    import random as _stdlib_random
+
+    from app.api.routes.templates_editor import clips as clips_module
+
+    from packages.domain.smart_match import SCORE_RANDOM_NOISE_MAX
+
+    _fallback = _stdlib_random.Random()
+
+    def _fake_uniform(a, b):
+        if b == SCORE_RANDOM_NOISE_MAX:
+            return 0.0
+        return _fallback.uniform(a, b)
+
+    return patch.object(clips_module.random, "uniform", _fake_uniform)
+
+
 def _patch_segments(segments=None):
    return patch(
        "app.api.routes.templates_editor.clips._get_template_segments",
@@ -58,6 +80,10 @@ def _make_mock_asset(asset_id, duration):
    asset = MagicMock()
    asset.id = asset_id
    asset.duration = duration
+    # score_asset 所需的属性（避免 MagicMock 导致类型比较错误）
+    asset.quality_score = None
+    asset.created_at = None
+    asset.metadata = {}
    return asset


@@ -126,7 +152,8 @@ class TestEditorClipsBySegments:

        body = ClipsFromAssetsRequest(asset_ids=["a1", "a2"], required_clips_count=2)

-        with _patch_segments(DEFAULT_SEGMENTS):
+        # 均衡分配由 use_count 贪心保证，消除排序噪声后确定性断言
+        with _patch_zero_noise(), _patch_segments(DEFAULT_SEGMENTS):
            result = create_clips_from_assets_editor(
                template_id="tpl-001",
                body=body,
@@ -414,8 +441,13 @@ class TestEditorClipsDurationAndStartTime:

        assert mock_calc.call_count == 2
        clips_data = _get_clips_data_from_call(mock_plan_svc)
-        assert clips_data[0]["start_time"] == 12.5
-        assert clips_data[1]["start_time"] == 18.0
+        # clips_data 按 order 排序，但分配顺序因 shuffle 而随机，
+        # 因此只验证两个 start_time 值都存在
+        start_times = {c["start_time"] for c in clips_data}
+        assert start_times == {12.5, 18.0}
+        # 验证 order 仍然有序
+        orders = [c["order"] for c in clips_data]
+        assert orders == sorted(orders)

    @patch("app.api.routes.templates_editor.clips.get_storage_service")
    def test_asset_durations_deduped(self, mock_storage):
@@ -786,7 +818,8 @@ class TestClipsFromAssetsInvalidIds:

        body = ClipsFromAssetsRequest(asset_ids=["a1", None, "", "a2"])  # type: ignore[list-item]

-        with _patch_segments(_segments(2, dur_min=3.0, dur_max=5.0)):
+        # 消除排序噪声，确定性断言两条合法素材各被使用
+        with _patch_zero_noise(), _patch_segments(_segments(2, dur_min=3.0, dur_max=5.0)):
            result = create_clips_from_assets_editor(
                template_id="tpl-001",
                body=body,
@@ -306,6 +306,27 @@ class TestGetTemplateSegments:
 # ── from-assets 端点集成测试 ────────────────────────────────────────────────


+def _patch_zero_noise():
+    """消除 clips.py 排序随机噪声（SCORE_RANDOM_NOISE_MAX 噪声返回 0）。
+
+    用于均衡分配等确定性断言；其他 uniform 调用（片段时长随机）行为不变。
+    """
+    import random as _stdlib_random
+
+    from app.api.routes.templates_editor import clips as clips_module
+
+    from packages.domain.smart_match import SCORE_RANDOM_NOISE_MAX
+
+    _fallback = _stdlib_random.Random()
+
+    def _fake_uniform(a, b):
+        if b == SCORE_RANDOM_NOISE_MAX:
+            return 0.0
+        return _fallback.uniform(a, b)
+
+    return patch.object(clips_module.random, "uniform", _fake_uniform)
+
+
 def _make_auth_user():
    auth = MagicMock()
    auth.user.id = "user-001"
@@ -347,6 +368,10 @@ def _make_rich_asset(asset_id, duration, storage_key="v.mp4", mime="video/mp4"):
    asset.duration = duration
    asset.storage_key = storage_key
    asset.mime_type = mime
+    # score_asset 所需的属性（避免 MagicMock 导致类型比较错误）
+    asset.quality_score = None
+    asset.created_at = None
+    asset.metadata = {}
    return asset


@@ -442,8 +467,12 @@ class TestFromAssetsByTemplateSegments:
        )

        clips_data = _get_clips_data(mock_plan_svc)
-        assert 3.0 <= clips_data[0]["duration"] <= 5.0
-        assert 4.0 <= clips_data[1]["duration"] <= 8.0
+        # PR #1614 转场补偿：2 个片段时每 clip 时长 +(2-1)*0.5/2=0.25s
+        # （xfade 重叠在渲染时扣除，故 clip 时长 = segment 随机时长 + 补偿），
+        # 断言上界需计入补偿与一位小数舍入余量
+        comp = (2 - 1) * 0.5 / 2
+        assert 3.0 + comp - 0.1 <= clips_data[0]["duration"] <= 5.0 + comp + 0.1
+        assert 4.0 + comp - 0.1 <= clips_data[1]["duration"] <= 8.0 + comp + 0.1

    def test_assets_balanced_assignment(self):
        """素材按使用次数贪心分配（使用少的优先），保证均衡使用。"""
@@ -462,16 +491,18 @@ class TestFromAssetsByTemplateSegments:
        mock_asset_repo.get.side_effect = get_asset

        body = ClipsFromAssetsRequest(asset_ids=["a1", "a2"])
-        create_clips_from_assets_editor(
-            template_id="tmpl-1",
-            body=body,
-            background_tasks=MagicMock(),
-            plan_id="plan-1",
-            services=(mock_tpl_svc, mock_plan_svc),
-            asset_repo=mock_asset_repo,
-            db=MagicMock(),
-            current_user=_make_auth_user(),
-        )
+        # 消除排序噪声，确定性断言贪心均衡分配
+        with _patch_zero_noise():
+            create_clips_from_assets_editor(
+                template_id="tmpl-1",
+                body=body,
+                background_tasks=MagicMock(),
+                plan_id="plan-1",
+                services=(mock_tpl_svc, mock_plan_svc),
+                asset_repo=mock_asset_repo,
+                db=MagicMock(),
+                current_user=_make_auth_user(),
+            )

        clips_data = _get_clips_data(mock_plan_svc)
        asset_ids = [c["asset_id"] for c in clips_data]
@@ -908,6 +908,10 @@ class TestAssetDurationsAlwaysFetched:
        def fake_get(asset_id):
            mock_asset = MagicMock()
            mock_asset.duration = 30.0  # 每个素材 30 秒
+            # score_asset 所需的属性
+            mock_asset.quality_score = None
+            mock_asset.created_at = None
+            mock_asset.metadata = {}
            return mock_asset

        asset_repo.get = MagicMock(side_effect=fake_get)
@@ -0,0 +1,368 @@
+"""测试 SceneChange 场景检测前置到渲染前 + 场景点缓存读写。
+
+验证：
+- 场景点缓存读取（extract_scene_points_from_metadata）：合法/非法/脏数据
+- pick_scene_aware_start：随机镜头段选取、冲突避让、shuffle 随机化、无缓存回退 None
+- from-assets 路径：metadata 有 scene_change_points 时，start_time 落在镜头段内
+- 一键生成路径：distribute_assets 传入 asset_scene_points 时使用镜头段
+- 后台任务：检测结果写入素材 metadata（缓存）
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+os.environ.setdefault("JWT_SECRET_KEY", "unit-test-secret-key-for-testing")
+os.environ.setdefault("DATABASE_URL", "sqlite:///test.db")
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "apps" / "api"))
+
+import pytest
+
+from packages.domain.plan_generator_utils import (
+    _calc_random_start_time,
+    build_scene_segments,
+    distribute_assets,
+    extract_scene_points_from_metadata,
+    pick_scene_aware_start,
+)
+
+# ── metadata 缓存解析 ─────────────────────────────────────────────────────────
+
+
+class TestExtractScenePoints:
+    def test_valid_points(self):
+        md = {"scene_change_points": [0.0, 3.2, 7.8, 12.5]}
+        assert extract_scene_points_from_metadata(md) == [0.0, 3.2, 7.8, 12.5]
+
+    def test_missing_returns_none(self):
+        assert extract_scene_points_from_metadata({}) is None
+        assert extract_scene_points_from_metadata(None) is None
+        assert extract_scene_points_from_metadata("not-a-dict") is None
+
+    def test_empty_list_returns_none(self):
+        assert extract_scene_points_from_metadata({"scene_change_points": []}) is None
+        assert extract_scene_points_from_metadata({"scene_change_points": [0.0]}) is None
+
+    def test_dirty_data_returns_none(self):
+        assert extract_scene_points_from_metadata({"scene_change_points": ["a", 1.0]}) is None
+
+    def test_auto_prepends_zero(self):
+        result = extract_scene_points_from_metadata({"scene_change_points": [3.2, 7.8]})
+        assert result == [0.0, 3.2, 7.8]
+
+    def test_sorts_unsorted(self):
+        result = extract_scene_points_from_metadata({"scene_change_points": [0.0, 12.5, 3.2, 7.8]})
+        assert result == [0.0, 3.2, 7.8, 12.5]
+
+    def test_negative_rejected(self):
+        assert extract_scene_points_from_metadata({"scene_change_points": [-1.0, 3.2]}) is None
+
+
+# ── 镜头段选取 ────────────────────────────────────────────────────────────────
+
+
+class TestPickSceneAwareStart:
+    def test_start_within_some_scene_segment(self):
+        """有缓存时，起点落在某个镜头段内部。"""
+        points = [0.0, 5.0, 10.0, 15.0]
+        durations = {"a1": 18.0}
+        scene_points = {"a1": points}
+        used: dict = {}
+        start = pick_scene_aware_start("a1", 3.0, durations, scene_points, used)
+        assert start is not None
+        segments = build_scene_segments(points, 18.0)
+        assert any(seg_start <= start and start + 3.0 <= seg_end for seg_start, seg_end in segments)
+
+    def test_no_cache_returns_none(self):
+        """无缓存返回 None（调用方回退随机起点）。"""
+        result = pick_scene_aware_start("a1", 3.0, {"a1": 18.0}, {}, {})
+        assert result is None
+
+    def test_bounds_respected(self):
+        """起点 + 片段时长不超过素材总时长。"""
+        points = [0.0, 5.0, 10.0, 15.0]
+        for _ in range(30):
+            start = pick_scene_aware_start("a1", 4.0, {"a1": 18.0}, {"a1": points}, {})
+            assert start is not None
+            assert start + 4.0 <= 18.0 + 1e-6
+
+    def test_conflict_avoidance(self):
+        """所有镜头段都被占满时返回 None（回退随机路径）。"""
+        # 3 段各 6s，片段 5s；把所有段占满（[0,5.5] [5.5,11] 覆盖段1/2，段3太短放不下5s）
+        points = [0.0, 6.0, 12.0]
+        used = {"a1": [(0.0, 5.6), (6.0, 11.6)]}
+        # 段3 [12, 18] 可用 → 应返回其中起点
+        start = pick_scene_aware_start("a1", 5.0, {"a1": 18.0}, {"a1": points}, used)
+        assert start is not None
+        assert start >= 12.0
+
+    def test_all_segments_conflict_returns_none(self):
+        """全部镜头段都冲突时返回 None。"""
+        points = [0.0, 6.0, 12.0]
+        # 占满整个素材
+        used = {"a1": [(0.0, 18.0)]}
+        start = pick_scene_aware_start("a1", 5.0, {"a1": 18.0}, {"a1": points}, used)
+        assert start is None
+
+    def test_shuffle_produces_varied_segments(self):
+        """镜头段顺序被 shuffle：30 次选取，起点分布应覆盖多个镜头段。"""
+        points = [0.0, 5.0, 10.0, 15.0]
+        observed: set[int] = set()
+        for _ in range(40):
+            start = pick_scene_aware_start("a1", 2.0, {"a1": 18.0}, {"a1": points}, {})
+            assert start is not None
+            # 记录起点落在哪个段（段宽 5s）
+            observed.add(int(start // 5.0))
+        assert len(observed) >= 3, f"镜头段 shuffle 后应覆盖多个段，实际 {observed}"
+
+
+# ── 一键生成路径：distribute_assets 接入场景缓存 ──────────────────────────────
+
+
+class TestDistributeWithScenePoints:
+    def _make_clips(self, n):
+        from packages.domain.edit_plan_clip import EditPlanClip
+
+        return [EditPlanClip(id=f"c{i}", plan_id="p1", clip_type="main", duration=4.0, order=i) for i in range(n)]
+
+    def test_one_take_uses_scene_segments(self):
+        """ONE_TAKE 模式下，有场景缓存的素材起点落在镜头段内。"""
+        from packages.domain.editing_mode import EditingMode
+
+        clips = self._make_clips(2)
+        points = [0.0, 6.0, 12.0, 18.0]
+        distribute_assets(
+            clips,
+            ["a1"],
+            EditingMode.ONE_TAKE.value,
+            asset_durations={"a1": 24.0},
+            asset_scene_points={"a1": points},
+        )
+        segments = build_scene_segments(points, 24.0)
+        for clip in clips:
+            assert clip.start_time is not None
+            assert any(
+                s <= clip.start_time and clip.start_time + 4.0 <= e for s, e in segments
+            ), f"起点 {clip.start_time} 不在任何镜头段内"
+
+    def test_no_scene_points_falls_back_random(self):
+        """无场景缓存时正常分配（回退随机起点），不报错。"""
+        from packages.domain.editing_mode import EditingMode
+
+        clips = self._make_clips(1)
+        distribute_assets(
+            clips,
+            ["a1"],
+            EditingMode.ONE_TAKE.value,
+            asset_durations={"a1": 24.0},
+            asset_scene_points={},
+        )
+        for clip in clips:
+            assert clip.asset_id == "a1"
+            assert clip.start_time is not None
+            assert 0.0 <= clip.start_time <= 20.0
+
+    def test_random_preview_ignores_scene_points(self):
+        """random_selection 预览模式行为不变（不崩溃、正常分配）。"""
+        from packages.domain.editing_mode import EditingMode
+
+        clips = self._make_clips(2)
+        distribute_assets(
+            clips,
+            ["a1", "a2"],
+            EditingMode.ONE_TAKE.value,
+            random_selection=True,
+            asset_durations={"a1": 24.0, "a2": 24.0},
+            asset_scene_points={"a1": [0.0, 6.0]},
+        )
+        assert all(c.asset_id for c in clips)
+
+
+# ── from-assets 路径：渲染前读缓存选镜头段 ────────────────────────────────────
+
+
+def _make_auth_user():
+    auth = MagicMock()
+    auth.user.id = "user-001"
+    auth.user.email = "test@example.com"
+    auth.user.display_name = "测试用户"
+    auth.user_id = "user-001"
+    return auth
+
+
+def _make_asset_with_scenes(aid, duration, scene_points=None):
+    asset = MagicMock()
+    asset.id = aid
+    asset.duration = duration
+    asset.quality_score = None
+    asset.created_at = None
+    asset.metadata = {"scene_change_points": scene_points} if scene_points is not None else {}
+    return asset
+
+
+class TestFromAssetsSceneCache:
+    def test_cached_scene_points_used_for_start_time(self):
+        """素材 metadata 有场景点缓存时，片段起点落在镜头段内。"""
+        from app.api.routes.templates_editor.clips import create_clips_from_assets_editor
+        from app.api.routes.templates_editor.schemas import ClipsFromAssetsRequest
+
+        # 镜头段宽度 10s，片段最长 ~5.3s（含转场补偿），每段都能容纳
+        scene_points = [0.0, 10.0, 20.0, 30.0]
+        asset_duration = 40.0
+        mock_asset_repo = MagicMock()
+        mock_asset_repo.get = MagicMock(
+            side_effect=lambda aid: _make_asset_with_scenes(aid, asset_duration, scene_points)
+        )
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.replace_all_clips_transactional = MagicMock(return_value=3)
+
+        segments = [(0, 3.0, 5.0), (1, 3.0, 5.0), (2, 3.0, 5.0)]
+
+        with (
+            patch(
+                "app.api.routes.templates_editor.clips._get_template_segments",
+                return_value=segments,
+            ),
+            patch("app.api.routes.templates_editor.clips.get_used_segments", return_value={}),
+            patch("app.api.routes.templates_editor.clips.record_used_segments", return_value=None),
+        ):
+            body = ClipsFromAssetsRequest(asset_ids=["a1"], required_clips_count=3)
+            create_clips_from_assets_editor(
+                template_id="tmpl-1",
+                body=body,
+                background_tasks=MagicMock(),
+                plan_id="plan-scene-1",
+                services=(MagicMock(), mock_plan_svc),
+                asset_repo=mock_asset_repo,
+                db=MagicMock(),
+                current_user=_make_auth_user(),
+            )
+
+        clips_data = mock_plan_svc.replace_all_clips_transactional.call_args.args[1]
+        scene_segments = build_scene_segments(scene_points, asset_duration)
+        for clip in clips_data:
+            start = clip["start_time"]
+            dur = clip["duration"]
+            in_segment = any(s <= start and start + dur <= e + 0.1 for s, e in scene_segments)
+            assert in_segment, f"起点 {start:.2f} 时长 {dur:.2f} 不在任何镜头段内"
+
+    def test_no_cache_falls_back_random_no_error(self):
+        """素材无场景缓存时正常走随机起点，流程不报错。"""
+        from app.api.routes.templates_editor.clips import create_clips_from_assets_editor
+        from app.api.routes.templates_editor.schemas import ClipsFromAssetsRequest
+
+        mock_asset_repo = MagicMock()
+        mock_asset_repo.get = MagicMock(side_effect=lambda aid: _make_asset_with_scenes(aid, 30.0, None))
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.replace_all_clips_transactional = MagicMock(return_value=2)
+
+        segments = [(0, 3.0, 5.0), (1, 3.0, 5.0)]
+        with (
+            patch(
+                "app.api.routes.templates_editor.clips._get_template_segments",
+                return_value=segments,
+            ),
+            patch("app.api.routes.templates_editor.clips.get_used_segments", return_value={}),
+            patch("app.api.routes.templates_editor.clips.record_used_segments", return_value=None),
+        ):
+            body = ClipsFromAssetsRequest(asset_ids=["a1"], required_clips_count=2)
+            create_clips_from_assets_editor(
+                template_id="tmpl-1",
+                body=body,
+                background_tasks=MagicMock(),
+                plan_id="plan-scene-2",
+                services=(MagicMock(), mock_plan_svc),
+                asset_repo=mock_asset_repo,
+                db=MagicMock(),
+                current_user=_make_auth_user(),
+            )
+        clips_data = mock_plan_svc.replace_all_clips_transactional.call_args.args[1]
+        assert len(clips_data) == 2
+        assert all(c["start_time"] is not None for c in clips_data)
+
+
+# ── 后台任务：检测结果写缓存 ──────────────────────────────────────────────────
+
+
+class TestAsyncCacheWrite:
+    def test_scene_points_persisted_to_metadata(self):
+        """detect_scene_changes 返回结果后写入素材 metadata 并调用 repo.update。"""
+        from app.api.routes.templates_editor import clips as clips_module
+
+        detected_points = [0.0, 4.5, 9.0, 14.2]
+
+        mock_asset = MagicMock()
+        mock_asset.id = "a1"
+        mock_asset.duration = 20.0
+        mock_asset.storage_key = "v.mp4"
+        mock_asset.mime_type = "video/mp4"
+        mock_asset.metadata = {}
+
+        mock_asset_repo = MagicMock()
+        mock_asset_repo.find_by_ids = MagicMock(return_value=[mock_asset])
+        mock_asset_repo.update = MagicMock(side_effect=lambda a: a)
+
+        mock_clip = MagicMock()
+        mock_clip.id = "clip-1"
+        mock_clip.asset_id = "a1"
+        mock_clip.order = 0
+        mock_clip.start_time = 2.0
+        mock_clip.duration = 4.0
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.list_clips = MagicMock(return_value=[mock_clip])
+        mock_plan_svc.update_clip = MagicMock()
+        plan_svc_factory = MagicMock(return_value=mock_plan_svc)
+
+        mock_client = MagicMock()
+        mock_client.is_available = True
+        mock_client.detect_scene_changes = MagicMock(return_value=detected_points)
+
+        mock_storage = MagicMock()
+        mock_storage.get_download_url = MagicMock(return_value="https://example.com/v.mp4")
+
+        mock_session = MagicMock()
+
+        with (
+            patch(
+                "packages.adapters.sqlalchemy_impl.asset_repository.SQLAlchemyAssetRepository",
+                return_value=mock_asset_repo,
+            ),
+            patch(
+                "app.api.routes.templates_editor.clips.EditPlanService",
+                plan_svc_factory,
+            ),
+            patch(
+                "packages.adapters.sqlalchemy_impl.session.SessionLocal",
+                MagicMock(return_value=mock_session),
+            ),
+            patch(
+                "app.api.routes.templates_editor.clips.get_storage_service",
+                return_value=mock_storage,
+            ),
+            patch(
+                "app.api.routes.templates_editor.clips.get_mediakit_client",
+                return_value=mock_client,
+            ),
+            patch(
+                "app.api.routes.templates_editor.clips.get_used_segments",
+                return_value={},
+            ),
+            patch(
+                "app.api.routes.templates_editor.clips.record_used_segments",
+                return_value=None,
+            ),
+            patch(
+                "app.api.routes.templates_editor.clips.remove_used_segment",
+                return_value=False,
+            ),
+        ):
+            clips_module._update_mediakit_recommendations_async("plan-1", ["a1"])
+
+        # 验证素材 metadata 被写入场景点并持久化
+        assert mock_asset.metadata.get("scene_change_points") == detected_points
+        mock_asset_repo.update.assert_called()
@@ -0,0 +1,257 @@
+"""Tests for scene-change smart frame selection + random shuffle of segment processing."""
+
+from __future__ import annotations
+
+import random
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from apps.api.app.api.routes.templates_editor.clips import (
+    _build_scene_segments,
+    _pick_start_in_scene_segment,
+)
+from packages.shared.mediakit_client import MediaKitClient
+
+# ── Part 1: Random shuffle tests ──────────────────────────────────────────
+
+
+class TestRandomShuffle:
+    """验证 segments 处理顺序随机打乱逻辑."""
+
+    def test_same_segments_produce_different_asset_orders(self):
+        """同一批 segments 多次处理，asset 分配顺序有变化.
+
+        模拟打乱后的处理顺序，验证多次运行中 asset_id 分配顺序
+        存在差异（概率性验证，运行 50 次应该至少出现 2 种排列）。
+        """
+        segments = [(0, 3.0, 5.0), (1, 4.0, 6.0), (2, 3.0, 5.0), (3, 4.0, 6.0)]
+        asset_ids = ["A", "B", "C", "D"]
+
+        observed_orders: list[tuple] = set()
+
+        for _ in range(50):
+            shuffled_indices = list(range(len(segments)))
+            random.shuffle(shuffled_indices)
+            order_tuple = tuple(shuffled_indices)
+            observed_orders.add(order_tuple)
+
+        # 50 次打乱，4! = 24 种排列，应出现多种不同排列
+        assert len(observed_orders) > 1, "打乱应该产生多种不同顺序"
+
+    def test_clips_data_order_always_sorted(self):
+        """clips_data 按 order 排序后始终有序.
+
+        模拟打乱处理后 clips_data 按 order 排序，验证最终 order 为 [0,1,2,3]。
+        """
+        segments = [(0, 3.0, 5.0), (1, 4.0, 6.0), (2, 3.0, 5.0), (3, 4.0, 6.0)]
+
+        for _ in range(20):
+            shuffled_indices = list(range(len(segments)))
+            random.shuffle(shuffled_indices)
+
+            # 模拟构建 clips_data（用 _seg_order 作为 order）
+            clips_data = []
+            for idx in shuffled_indices:
+                seg_order, _, _ = segments[idx]
+                clips_data.append({"order": seg_order, "asset_id": f"asset_{idx}"})
+
+            # 按 order 排序
+            clips_data.sort(key=lambda c: c["order"])
+
+            # 验证 order 始终有序
+            orders = [c["order"] for c in clips_data]
+            assert orders == [0, 1, 2, 3], f"排序后 order 应为 [0,1,2,3]，实际为 {orders}"
+
+
+# ── Part 2: detect_scene_changes tests ────────────────────────────────────
+
+
+class TestDetectSceneChanges:
+    """验证 MediaKitClient.detect_scene_changes 方法."""
+
+    def _make_client(self) -> MediaKitClient:
+        """创建一个可用的 MediaKitClient（mock 配置）."""
+        with patch("packages.shared.mediakit_client.get_shared_settings") as mock_settings:
+            mock_settings.return_value.mediakit_api_key = "test-key"
+            mock_settings.return_value.mediakit_base_url = "http://test"
+            mock_settings.return_value.mediakit_timeout = 30
+            client = MediaKitClient()
+        return client
+
+    def test_scene_change_success(self):
+        """SceneChange 策略成功返回时间戳列表."""
+        client = self._make_client()
+
+        mock_frames = [
+            {"image_url": "url1", "timestamp": 0.0},
+            {"image_url": "url2", "timestamp": 3.2},
+            {"image_url": "url3", "timestamp": 7.8},
+            {"image_url": "url4", "timestamp": 12.5},
+        ]
+
+        with patch.object(client, "extract_frames", return_value=mock_frames):
+            result = client.detect_scene_changes("https://example.com/video.mp4")
+
+        assert result is not None
+        assert result[0] == 0.0  # 始终以 0.0 开头
+        assert 3.2 in result
+        assert 7.8 in result
+        assert 12.5 in result
+        assert result == sorted(result)  # 应已排序
+
+    def test_scene_change_fallback_to_time_interval(self):
+        """SceneChange 失败降级到 TimeInterval 策略."""
+        client = self._make_client()
+
+        # 第一次调用（SceneChange）返回 None，第二次（TimeInterval）返回结果
+        fallback_frames = [
+            {"image_url": "url1", "timestamp": 0.0},
+            {"image_url": "url2", "timestamp": 5.0},
+            {"image_url": "url3", "timestamp": 10.0},
+        ]
+
+        call_count = 0
+
+        def side_effect(*args, **kwargs):
+            nonlocal call_count
+            call_count += 1
+            if call_count == 1:
+                # 第一次 SceneChange 失败
+                return None
+            else:
+                # 第二次 TimeInterval 成功
+                assert kwargs.get("strategy") == "TimeInterval"
+                return fallback_frames
+
+        with patch.object(client, "extract_frames", side_effect=side_effect):
+            result = client.detect_scene_changes("https://example.com/video.mp4")
+
+        assert result is not None
+        assert result[0] == 0.0
+        assert 5.0 in result
+        assert 10.0 in result
+
+    def test_mediakit_not_available_returns_none(self):
+        """MediaKit 不可用时返回 None."""
+        with patch("packages.shared.mediakit_client.get_shared_settings") as mock_settings:
+            mock_settings.return_value.mediakit_api_key = ""  # 未配置
+            mock_settings.return_value.mediakit_base_url = "http://test"
+            mock_settings.return_value.mediakit_timeout = 30
+            client = MediaKitClient()
+
+        result = client.detect_scene_changes("https://example.com/video.mp4")
+        assert result is None
+
+    def test_both_strategies_fail_returns_none(self):
+        """SceneChange 和 TimeInterval 都失败时返回 None."""
+        client = self._make_client()
+
+        with patch.object(client, "extract_frames", return_value=None):
+            result = client.detect_scene_changes("https://example.com/video.mp4")
+
+        assert result is None
+
+    def test_prepends_zero_if_not_present(self):
+        """若帧列表中不包含 0.0，自动在开头添加."""
+        client = self._make_client()
+
+        # 帧列表中没有 timestamp=0.0
+        mock_frames = [
+            {"image_url": "url1", "timestamp": 2.0},
+            {"image_url": "url2", "timestamp": 5.5},
+        ]
+
+        with patch.object(client, "extract_frames", return_value=mock_frames):
+            result = client.detect_scene_changes("https://example.com/video.mp4")
+
+        assert result is not None
+        assert result[0] == 0.0
+        assert 2.0 in result
+        assert 5.5 in result
+
+
+# ── Part 2.2: Scene segment building and assignment ───────────────────────
+
+
+class TestSceneSegments:
+    """验证镜头段构建和分配逻辑."""
+
+    def test_build_scene_segments(self):
+        """从场景切换点正确构建镜头段."""
+        scene_changes = [0.0, 3.2, 7.8, 12.5]
+        asset_duration = 15.0
+
+        segments = _build_scene_segments(scene_changes, asset_duration)
+
+        assert len(segments) == 4
+        assert segments[0] == (0.0, 3.2)
+        assert segments[1] == (3.2, 7.8)
+        assert segments[2] == (7.8, 12.5)
+        assert segments[3] == (12.5, 15.0)
+
+    def test_build_scene_segments_filters_short(self):
+        """过滤掉过短的镜头段（< 0.5秒）."""
+        scene_changes = [0.0, 0.1, 5.0, 5.3, 10.0]
+        asset_duration = 12.0
+
+        segments = _build_scene_segments(scene_changes, asset_duration)
+
+        # (0.0, 0.1) 长度 0.1 < 0.5 → 过滤
+        # (0.1, 5.0) → 保留
+        # (5.0, 5.3) 长度 0.3 < 0.5 → 过滤
+        # (5.3, 10.0) → 保留
+        # (10.0, 12.0) → 保留
+        assert len(segments) == 3
+        assert segments[0] == (0.1, 5.0)
+        assert segments[1] == (5.3, 10.0)
+        assert segments[2] == (10.0, 12.0)
+
+    def test_pick_start_in_segment(self):
+        """在镜头段内随机选取起始时间."""
+        seg_start = 3.0
+        seg_end = 8.0
+        clip_duration = 2.0
+
+        starts = set()
+        for _ in range(100):
+            start = _pick_start_in_scene_segment(seg_start, seg_end, clip_duration)
+            assert start is not None
+            assert seg_start <= start <= seg_end - clip_duration
+            starts.add(round(start, 2))
+
+        # 应该有多个不同的起始时间
+        assert len(starts) > 1
+
+    def test_pick_start_segment_too_short(self):
+        """镜头段太短无法容纳片段时返回 None."""
+        result = _pick_start_in_scene_segment(0.0, 1.0, 2.0)
+        assert result is None
+
+    def test_different_clips_from_different_scenes(self):
+        """不同片段应来自不同的镜头段（模拟分配逻辑）."""
+        scene_changes = [0.0, 5.0, 10.0, 15.0]
+        asset_duration = 18.0
+        clip_duration = 3.0
+
+        segments = _build_scene_segments(scene_changes, asset_duration)
+        assert len(segments) == 4  # (0,5), (5,10), (10,15), (15,18)
+
+        # 模拟 3 个片段从不同镜头段取点
+        scene_pool = list(segments)
+        assigned_starts = []
+
+        for _ in range(3):
+            if not scene_pool:
+                break
+            seg_start, seg_end = scene_pool.pop(0)
+            start = _pick_start_in_scene_segment(seg_start, seg_end, clip_duration)
+            assert start is not None
+            assigned_starts.append(start)
+
+        # 3 个片段分别从 3 个不同镜头段中选取
+        assert len(assigned_starts) == 3
+        # 第一个来自 [0, 2]，第二个来自 [5, 7]，第三个来自 [10, 12]
+        assert 0.0 <= assigned_starts[0] <= 2.0
+        assert 5.0 <= assigned_starts[1] <= 7.0
+        assert 10.0 <= assigned_starts[2] <= 12.0
@@ -0,0 +1,475 @@
+"""测试 smart_match 评分集成到素材选取路径。
+
+验证：
+- 使用次数多的素材评分低于使用次数少的（unused 维度降权生效）
+- from-assets 路径中 sorted_candidates 按 smart_match 评分排序
+- 一键生成路径中 _sort_assets_by_smart_score 按评分降序
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+from dataclasses import dataclass, field
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+from unittest.mock import MagicMock, patch
+
+os.environ.setdefault("JWT_SECRET_KEY", "unit-test-secret-key-for-testing")
+os.environ.setdefault("DATABASE_URL", "sqlite:///test.db")
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "apps" / "api"))
+
+import pytest
+
+from packages.domain.smart_match import SCORE_RANDOM_NOISE_MAX, score_asset, smart_select_assets
+
+# ── 辅助工厂 ──────────────────────────────────────────────────────────────────
+
+
+@dataclass
+class FakeAsset:
+    """Minimal Asset-like object."""
+
+    id: str
+    quality_score: float | None = 70.0
+    duration: float = 15.0
+    created_at: datetime | None = None
+    metadata: dict[str, Any] = field(default_factory=dict)
+    status: str = "ready"
+    file_type: str = "video"
+
+
+def _asset_with_use_count(asset_id: str, use_count: int) -> FakeAsset:
+    """创建指定使用次数的素材，其他维度保持一致。"""
+    return FakeAsset(
+        id=asset_id,
+        quality_score=70.0,
+        duration=15.0,  # 最优区间 5-30s
+        created_at=datetime(2026, 1, 1, tzinfo=timezone.utc),
+        metadata={"generation_use_count": use_count},
+    )
+
+
+# ── score_asset 单元测试：unused 维度降权 ─────────────────────────────────────
+
+
+class TestScoreAssetUnusedDiminsh:
+    """验证 unused 维度：使用次数越多，评分越低。"""
+
+    def test_unused_scores_higher_than_used(self):
+        """use_count=0 的素材评分高于 use_count>0 的。"""
+        fresh = _asset_with_use_count("fresh", 0)
+        used = _asset_with_use_count("used", 1)
+        fresh_score, _ = score_asset(fresh)
+        used_score, _ = score_asset(used)
+        assert fresh_score > used_score
+
+    def test_high_use_count_scores_lower_than_low(self):
+        """use_count=5 的素材评分低于 use_count=1 的。"""
+        low_use = _asset_with_use_count("low", 1)
+        high_use = _asset_with_use_count("high", 5)
+        low_score, _ = score_asset(low_use)
+        high_score, _ = score_asset(high_use)
+        assert low_score > high_score
+
+    def test_unused_breakdown_values(self):
+        """验证 unused 维度的具体分值。"""
+        fresh = _asset_with_use_count("fresh", 0)
+        low = _asset_with_use_count("low", 2)
+        high = _asset_with_use_count("high", 10)
+
+        _, fresh_bd = score_asset(fresh)
+        _, low_bd = score_asset(low)
+        _, high_bd = score_asset(high)
+
+        # use_count=0 → unused_score=100 → component=10.0
+        assert fresh_bd["unused"] == 10.0
+        # use_count=2 → unused_score=70 → component=7.0
+        assert low_bd["unused"] == 7.0
+        # use_count=10 → unused_score=30 → component=3.0
+        assert high_bd["unused"] == 3.0
+
+    def test_monotonically_decreasing_scores(self):
+        """使用次数递增时，总评分单调不增。"""
+        scores = []
+        for count in [0, 1, 2, 3, 5, 10, 50]:
+            a = _asset_with_use_count(f"a{count}", count)
+            s, _ = score_asset(a)
+            scores.append(s)
+        # 验证非递增
+        for i in range(len(scores) - 1):
+            assert (
+                scores[i] >= scores[i + 1]
+            ), f"use_count 递增时评分应不增: scores[{i}]={scores[i]} < scores[{i+1}]={scores[i+1]}"
+
+
+# ── smart_select_assets 排序测试 ─────────────────────────────────────────────
+
+
+class TestSmartSelectAssetsOrdering:
+    """验证 smart_select_assets 返回结果按评分降序。"""
+
+    def test_less_used_assets_ranked_higher(self):
+        """使用次数少的素材在结果中排名更高。"""
+        assets = [
+            _asset_with_use_count("heavily_used", 10),
+            _asset_with_use_count("never_used", 0),
+            _asset_with_use_count("lightly_used", 2),
+        ]
+        results = smart_select_assets(assets)
+        ids = [r.asset.id for r in results]
+        # never_used 排第一，heavily_used 排最后
+        assert ids[0] == "never_used"
+        assert ids[-1] == "heavily_used"
+
+    def test_same_quality_different_use_count(self):
+        """质量相同时，使用次数少的排名更高。"""
+        assets = [
+            _asset_with_use_count("used_5", 5),
+            _asset_with_use_count("used_0", 0),
+        ]
+        results = smart_select_assets(assets)
+        assert results[0].asset.id == "used_0"
+        assert results[1].asset.id == "used_5"
+
+
+# ── from-assets 路径集成测试 ─────────────────────────────────────────────────
+
+
+def _make_mock_asset_for_clips(aid, duration, use_count=0):
+    """创建带 score_asset 所需属性的 mock 素材。"""
+    asset = MagicMock()
+    asset.id = aid
+    asset.duration = duration
+    asset.quality_score = None
+    asset.created_at = None
+    asset.metadata = {"generation_use_count": use_count}
+    return asset
+
+
+def _make_auth_user():
+    auth = MagicMock()
+    auth.user.id = "user-001"
+    auth.user.email = "test@example.com"
+    auth.user.display_name = "测试用户"
+    auth.user_id = "user-001"
+    return auth
+
+
+def _make_zero_noise_patcher(module):
+    """构造 patch(module.random.uniform)：噪声调用(上界=SCORE_RANDOM_NOISE_MAX)返回 0。
+
+    其他 uniform 调用（如片段时长随机）委托给一个独立的 Random 实例，
+    避免递归回已 patch 的全局函数。
+    """
+    import random as _stdlib_random
+
+    _fallback = _stdlib_random.Random()
+
+    def _fake_uniform(a, b):
+        if b == SCORE_RANDOM_NOISE_MAX:
+            return 0.0
+        return _fallback.uniform(a, b)
+
+    return patch.object(module.random, "uniform", _fake_uniform)
+
+
+def _patch_zero_noise_clips():
+    """消除 clips.py 排序噪声，其他 uniform 调用不受影响。"""
+    from app.api.routes.templates_editor import clips as clips_module
+
+    return _make_zero_noise_patcher(clips_module)
+
+
+def _patch_zero_noise_plan_service():
+    """消除 plan_generator_service.py 排序噪声，其他 uniform 调用不受影响。"""
+    from app.services import plan_generator_service as svc_module
+
+    return _make_zero_noise_patcher(svc_module)
+
+
+class TestFromAssetsSmartMatchIntegration:
+    """验证 clips.py 中 sorted_candidates 使用 smart_match 评分。"""
+
+    def test_sorted_candidates_prefers_high_score_low_use_count(self):
+        """在 from-assets 路径中，smart_match 分高且使用次数少的素材排在前面。"""
+        from app.api.routes.templates_editor.clips import create_clips_from_assets_editor
+        from app.api.routes.templates_editor.schemas import ClipsFromAssetsRequest
+
+        mock_asset_repo = MagicMock()
+
+        def _get_asset(aid):
+            use_count = {"a_heavy": 10, "a_fresh": 0}[aid]
+            return _make_mock_asset_for_clips(aid, 30.0, use_count)
+
+        mock_asset_repo.get = MagicMock(side_effect=_get_asset)
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.replace_all_clips_transactional = MagicMock(return_value=2)
+
+        segments = [(0, 3.0, 5.0), (1, 3.0, 5.0)]
+
+        with (
+            _patch_zero_noise_clips(),
+            patch(
+                "app.api.routes.templates_editor.clips._get_template_segments",
+                return_value=segments,
+            ),
+            patch(
+                "app.api.routes.templates_editor.clips.get_used_segments",
+                return_value={},
+            ),
+            patch(
+                "app.api.routes.templates_editor.clips.record_used_segments",
+                return_value=None,
+            ),
+        ):
+            body = ClipsFromAssetsRequest(
+                asset_ids=["a_heavy", "a_fresh"],
+                required_clips_count=2,
+            )
+            create_clips_from_assets_editor(
+                template_id="tmpl-1",
+                body=body,
+                background_tasks=MagicMock(),
+                plan_id="test-plan-001",
+                services=(MagicMock(), mock_plan_svc),
+                asset_repo=mock_asset_repo,
+                db=MagicMock(),
+                current_user=_make_auth_user(),
+            )
+
+        # 验证 replace_all_clips_transactional 被调用
+        assert mock_plan_svc.replace_all_clips_transactional.called
+        call_args = mock_plan_svc.replace_all_clips_transactional.call_args
+        clips_data = call_args.args[1]
+
+        # 第一个片段应该分配给 a_fresh（smart_match 分更高）
+        first_clip_asset = clips_data[0]["asset_id"]
+        assert (
+            first_clip_asset == "a_fresh"
+        ), f"第一个片段应分配给 smart_match 分更高的 a_fresh，实际是 {first_clip_asset}"
+
+    def test_score_noise_causes_varied_selection(self):
+        """得分接近（差距 < SCORE_RANDOM_NOISE_MAX）的素材，多次生成的素材组合应有变化。
+
+        两条同等质量/时长/新鲜度的素材（use_count 相同），smart_match 得分一致，
+        噪声让两者的相对排名随机浮动，多次调用首个片段的素材分布应两者都出现。
+        """
+        from app.api.routes.templates_editor.clips import create_clips_from_assets_editor
+        from app.api.routes.templates_editor.schemas import ClipsFromAssetsRequest
+
+        def _get_asset(aid):
+            return _make_mock_asset_for_clips(aid, 30.0, 0)
+
+        mock_asset_repo = MagicMock()
+        mock_asset_repo.get = MagicMock(side_effect=_get_asset)
+
+        segments = [(0, 3.0, 5.0), (1, 3.0, 5.0)]
+
+        first_assets: set[str] = set()
+        for _ in range(30):
+            mock_plan_svc = MagicMock()
+            mock_plan_svc.replace_all_clips_transactional = MagicMock(return_value=2)
+            with (
+                patch(
+                    "app.api.routes.templates_editor.clips._get_template_segments",
+                    return_value=segments,
+                ),
+                patch(
+                    "app.api.routes.templates_editor.clips.get_used_segments",
+                    return_value={},
+                ),
+                patch(
+                    "app.api.routes.templates_editor.clips.record_used_segments",
+                    return_value=None,
+                ),
+            ):
+                body = ClipsFromAssetsRequest(
+                    asset_ids=["a_x", "a_y"],
+                    required_clips_count=2,
+                )
+                create_clips_from_assets_editor(
+                    template_id="tmpl-1",
+                    body=body,
+                    background_tasks=MagicMock(),
+                    plan_id=f"plan-noise-{len(first_assets)}-{_}",
+                    services=(MagicMock(), mock_plan_svc),
+                    asset_repo=mock_asset_repo,
+                    db=MagicMock(),
+                    current_user=_make_auth_user(),
+                )
+            clips_data = mock_plan_svc.replace_all_clips_transactional.call_args.args[1]
+            first_assets.add(clips_data[0]["asset_id"])
+
+        assert first_assets == {
+            "a_x",
+            "a_y",
+        }, f"噪声应使两条等分素材的排名浮动，30 次调用首个片段应覆盖两者，实际 {first_assets}"
+
+
+# ── 一键生成路径集成测试 ─────────────────────────────────────────────────────
+
+
+class TestPlanGeneratorSmartMatchIntegration:
+    """验证 PlanGeneratorService._sort_assets_by_smart_score 排序正确。"""
+
+    def test_sort_assets_by_smart_score_descending(self):
+        """_sort_assets_by_smart_score 返回按评分降序排列的素材 ID。"""
+        from app.services.plan_generator_service import PlanGeneratorService
+
+        mock_asset_repo = MagicMock()
+
+        def _get_asset(aid):
+            use_count = {"high_use": 10, "low_use": 0, "mid_use": 3}[aid]
+            asset = MagicMock()
+            asset.id = aid
+            asset.duration = 15.0
+            asset.quality_score = None
+            asset.created_at = None
+            asset.metadata = {"generation_use_count": use_count}
+            return asset
+
+        mock_asset_repo.get = MagicMock(side_effect=_get_asset)
+
+        db = MagicMock()
+        svc = PlanGeneratorService(db, asset_repo=mock_asset_repo)
+
+        with _patch_zero_noise_plan_service():
+            sorted_ids = svc._sort_assets_by_smart_score(["high_use", "low_use", "mid_use"])
+
+        # low_use (0次) 应排第一，high_use (10次) 应排最后
+        assert sorted_ids[0] == "low_use"
+        assert sorted_ids[-1] == "high_use"
+        assert sorted_ids[1] == "mid_use"
+
+    def test_distribute_assets_uses_smart_score_ordering(self):
+        """_distribute_assets 在非随机模式下按 smart_match 评分排序素材。"""
+        from app.services.plan_generator_service import PlanGeneratorService
+
+        from packages.domain.edit_plan_clip import EditPlanClip
+        from packages.domain.editing_mode import EditingMode
+
+        mock_asset_repo = MagicMock()
+
+        def _get_asset(aid):
+            use_count = {"old_asset": 10, "new_asset": 0}[aid]
+            asset = MagicMock()
+            asset.id = aid
+            asset.duration = 30.0
+            asset.quality_score = None
+            asset.created_at = None
+            asset.metadata = {"generation_use_count": use_count}
+            return asset
+
+        mock_asset_repo.get = MagicMock(side_effect=_get_asset)
+
+        db = MagicMock()
+        svc = PlanGeneratorService(db, asset_repo=mock_asset_repo)
+
+        # 创建 2 个 main clips（需要提供 id 参数）
+        clips = [
+            EditPlanClip(id="c1", plan_id="p1", clip_type="main", duration=5.0, order=0),
+            EditPlanClip(id="c2", plan_id="p1", clip_type="main", duration=5.0, order=1),
+        ]
+
+        with (
+            _patch_zero_noise_plan_service(),
+            patch("app.services.plan_generator_service.distribute_assets") as mock_dist,
+        ):
+            svc._distribute_assets(
+                clips,
+                ["old_asset", "new_asset"],
+                EditingMode.ONE_TAKE.value,
+                random_selection=False,
+            )
+            # 验证传给 distribute_assets 的 asset_ids 按 smart_match 排序
+            call_args = mock_dist.call_args
+            passed_ids = call_args.args[1]
+            # new_asset (0次使用) 应排在 old_asset (10次使用) 前面
+            assert passed_ids[0] == "new_asset"
+            assert passed_ids[1] == "old_asset"
+
+    def test_random_selection_skips_smart_score_sort(self):
+        """random_selection=True 时不执行 smart_match 排序。"""
+        from app.services.plan_generator_service import PlanGeneratorService
+
+        from packages.domain.edit_plan_clip import EditPlanClip
+        from packages.domain.editing_mode import EditingMode
+
+        mock_asset_repo = MagicMock()
+        db = MagicMock()
+        svc = PlanGeneratorService(db, asset_repo=mock_asset_repo)
+
+        clips = [
+            EditPlanClip(id="c1", plan_id="p1", clip_type="main", duration=5.0, order=0),
+        ]
+
+        with patch("app.services.plan_generator_service.distribute_assets") as mock_dist:
+            svc._distribute_assets(
+                clips,
+                ["a1", "a2"],
+                EditingMode.ONE_TAKE.value,
+                random_selection=True,
+            )
+            # random_selection=True 时不应调用 asset_repo.get（不执行排序）
+            mock_asset_repo.get.assert_not_called()
+
+
+class TestPlanGeneratorScoreNoise:
+    """验证一键生成路径的评分排序注入了随机噪声。"""
+
+    def test_equal_scores_produce_varied_order(self):
+        """两条 smart_match 得分相同的素材，多次排序的首位应覆盖两者。"""
+        from app.services.plan_generator_service import PlanGeneratorService
+
+        def _get_asset(aid):
+            asset = MagicMock()
+            asset.id = aid
+            asset.duration = 15.0
+            asset.quality_score = None
+            asset.created_at = None
+            asset.metadata = {"generation_use_count": 0}
+            return asset
+
+        mock_asset_repo = MagicMock()
+        mock_asset_repo.get = MagicMock(side_effect=_get_asset)
+        svc = PlanGeneratorService(MagicMock(), asset_repo=mock_asset_repo)
+
+        first_ids: set[str] = set()
+        for _ in range(30):
+            order = svc._sort_assets_by_smart_score(["equal_a", "equal_b"])
+            first_ids.add(order[0])
+
+        assert first_ids == {
+            "equal_a",
+            "equal_b",
+        }, f"噪声应使等分素材排名浮动，30 次排序首位应覆盖两者，实际 {first_ids}"
+
+    def test_large_score_gap_not_flipped(self):
+        """得分差距远大于噪声上限时，低分素材不会因噪声超过高分素材。
+
+        quality 100 vs 0 → quality 维度差距 40 分 > 噪声上限 20，
+        其余维度完全一致，50 次排序高质量素材必须始终排第一。
+        """
+        from app.services.plan_generator_service import PlanGeneratorService
+
+        def _get_asset(aid):
+            quality = {"top": 100.0, "bad": 0.0}[aid]
+            asset = MagicMock()
+            asset.id = aid
+            asset.duration = 15.0
+            asset.quality_score = quality
+            asset.created_at = None
+            asset.metadata = {"generation_use_count": 0}
+            return asset
+
+        mock_asset_repo = MagicMock()
+        mock_asset_repo.get = MagicMock(side_effect=_get_asset)
+        svc = PlanGeneratorService(MagicMock(), asset_repo=mock_asset_repo)
+
+        for _ in range(50):
+            order = svc._sort_assets_by_smart_score(["top", "bad"])
+            assert order[0] == "top", f"质量差距 40 分 > 噪声上限，top 应始终排第一，实际 {order}"