fix(api): 一键生成自动选素材，创建计划时从项目视频素材库自动分配ready视频素材

- 根因：create_plan/generate-from-template 未传asset_ids时，片段asset_id全为空
  自动选素材逻辑仅在generate阶段兜底且需material_mode=auto（默认manual）
- 修复：在两个创建计划入口添加自动选素材逻辑
  - 未传asset_ids但有project_id时，从项目视频素材库选全部ready视频素材
  - 按创建时间降序排列（新素材在前）
  - 提取共享函数auto_select_video_assets到_helpers.py
- 影响范围：POST /edit-plans、POST /edit-plans/generate-from-template
  传了asset_ids的场景不受影响，行为完全不变

apps/api/app/api/routes/_helpers.py

@@ -46,3 +46,58 @@ def require_project_and_library(
     libraries = asset_library_repository.find_by_project(project_id)
     if not any(item.id == library_id for item in libraries):
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Asset library not found")
+
+
+def auto_select_video_assets(
+    *,
+    project_id: str,
+    asset_library_repo: Any,
+    asset_repo: Any,
+    logger=None,
+) -> list[str]:
+    """从项目视频素材库自动选取 ready 状态的视频素材。
+
+    Args:
+        project_id: 项目 ID
+        asset_library_repo: 素材库仓储
+        asset_repo: 素材仓储
+        logger: 可选的 logger 实例，用于记录警告
+
+    Returns:
+        选中的素材 ID 列表，无可用素材时返回空列表
+    """
+    if not project_id:
+        return []
+
+    # 找到项目的视频素材库
+    libs = asset_library_repo.find_by_project(project_id)
+    video_lib = None
+    for lib in libs:
+        lib_kind = lib.kind.value if hasattr(lib.kind, "value") else lib.kind
+        if lib_kind == "video":
+            video_lib = lib
+            break
+
+    if not video_lib:
+        if logger:
+            logger.warning("自动选素材: 项目 %s 无视频素材库", project_id)
+        return []
+
+    # 从素材库中选取 ready 状态的视频素材
+    assets = asset_repo.find_by_library(video_lib.id)
+    ready_videos = [
+        a
+        for a in assets
+        if (a.status.value if hasattr(a.status, "value") else a.status) == "ready"
+        and a.mime_type
+        and a.mime_type.startswith("video")
+    ]
+
+    if not ready_videos:
+        if logger:
+            logger.warning("自动选素材: 素材库 %s 无可用视频素材", video_lib.name)
+        return []
+
+    # 按创建时间降序（新素材在前）
+    ready_videos.sort(key=lambda a: a.created_at, reverse=True)
+    return [a.id for a in ready_videos]

apps/api/app/api/routes/edit_plans.py

@@ -22,7 +22,12 @@ from datetime import datetime
 from typing import Any, List, Optional
 
 from app.auth import AuthenticatedUser, get_current_user
-from app.dependencies import get_db_session, get_project_repository
+from app.dependencies import (
+    get_asset_library_repository,
+    get_asset_repository,
+    get_db_session,
+    get_project_repository,
+)
 from app.schemas.generation_task import GenerationTaskResponse
 from app.services import EditPlanService, EditTemplateService
 from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
@@ -32,7 +37,7 @@ from sqlalchemy.orm import Session
 from packages.domain.config_schemas import normalize_plan_config
 from packages.domain.edit_plan import EditPlan, EditPlanStatus
 
-from ._helpers import check_project_access
+from ._helpers import auto_select_video_assets, check_project_access
 
 logger = logging.getLogger(__name__)
 
@@ -365,6 +370,8 @@ def create_plan(
     db: Session = Depends(get_db_session),
     current_user: AuthenticatedUser = Depends(get_current_user),
     project_repository: Any = Depends(get_project_repository),
+    asset_repository: Any = Depends(get_asset_repository),
+    asset_library_repository: Any = Depends(get_asset_library_repository),
 ) -> EditPlanResponse:
     """创建剪辑计划
 
@@ -415,12 +422,29 @@ def create_plan(
     # 模板存在，从模板生成计划+片段
     clip_configs = template_svc.list_clip_configs(body.template_id, skip=0, limit=200)
 
+    # 自动选素材：未传 asset_ids 但有 project_id 时，从项目视频素材库选 ready 的视频素材
+    resolved_asset_ids = list(body.asset_ids)
+    if not resolved_asset_ids and project_id:
+        auto_assets = auto_select_video_assets(
+            project_id=project_id,
+            asset_library_repo=asset_library_repository,
+            asset_repo=asset_repository,
+            logger=logger,
+        )
+        if auto_assets:
+            resolved_asset_ids = auto_assets
+            logger.info(
+                "自动选素材: project_id=%s count=%d",
+                project_id,
+                len(auto_assets),
+            )
+
     generator = PlanGeneratorService(db)
     try:
         result = generator.generate_from_template(
             template=template,
             clip_configs=clip_configs,
-            asset_ids=body.asset_ids,
+            asset_ids=resolved_asset_ids,
             project_id=project_id,
             created_by_user_id=current_user.user.id,
             name=body.name,
@@ -447,10 +471,10 @@ def create_plan(
         )
 
     # 把 asset_ids 写入 plan.config，供生成时兜底分配使用
-    if body.asset_ids:
+    if resolved_asset_ids:
         current_config = plan.config or {}
-        if current_config.get("asset_ids") != body.asset_ids:
-            current_config["asset_ids"] = body.asset_ids
+        if current_config.get("asset_ids") != resolved_asset_ids:
+            current_config["asset_ids"] = resolved_asset_ids
             plan = svc.update_plan(plan.id, config=normalize_plan_config(current_config))
 
     logger.info(

apps/api/app/api/routes/edit_plans_timeline.py

@@ -10,7 +10,7 @@ from __future__ import annotations
 import logging
 from typing import Any, List
 
-from app.api.routes._helpers import check_project_access
+from app.api.routes._helpers import auto_select_video_assets, check_project_access
 from app.api.routes.edit_plans import (
     GenerateFromTemplateRequest,
     GenerateFromTemplateResponse,
@@ -18,7 +18,12 @@ from app.api.routes.edit_plans import (
     _to_response,
 )
 from app.auth import AuthenticatedUser, get_current_user
-from app.dependencies import get_db_session, get_project_repository
+from app.dependencies import (
+    get_asset_library_repository,
+    get_asset_repository,
+    get_db_session,
+    get_project_repository,
+)
 from app.services import EditPlanService, PlanGeneratorService
 from fastapi import APIRouter, Depends, HTTPException, status
 from pydantic import BaseModel, Field
@@ -161,6 +166,8 @@ def generate_from_template(
     db: Session = Depends(get_db_session),
     current_user: AuthenticatedUser = Depends(get_current_user),
     project_repository: Any = Depends(get_project_repository),
+    asset_repository: Any = Depends(get_asset_repository),
+    asset_library_repository: Any = Depends(get_asset_library_repository),
 ) -> GenerateFromTemplateResponse:
     """基于模板 + 素材自动生成剪辑计划"""
     from app.services import EditTemplateService
@@ -177,11 +184,28 @@ def generate_from_template(
 
     clip_configs = template_svc.list_clip_configs(body.template_id, skip=0, limit=200)
 
+    # 自动选素材：未传 asset_ids 但有 project_id 时，从项目视频素材库选 ready 的视频素材
+    resolved_asset_ids = list(body.asset_ids)
+    if not resolved_asset_ids and body.project_id:
+        auto_assets = auto_select_video_assets(
+            project_id=body.project_id,
+            asset_library_repo=asset_library_repository,
+            asset_repo=asset_repository,
+            logger=logger,
+        )
+        if auto_assets:
+            resolved_asset_ids = auto_assets
+            logger.info(
+                "generate-from-template 自动选素材: project_id=%s count=%d",
+                body.project_id,
+                len(auto_assets),
+            )
+
     generator = PlanGeneratorService(db)
     result = generator.generate_from_template(
         template=template,
         clip_configs=clip_configs,
-        asset_ids=body.asset_ids,
+        asset_ids=resolved_asset_ids,
         project_id=body.project_id,
         created_by_user_id=current_user.user.id,
         name=body.name,