feat: 素材重复上传检测 + 批量生成视频

任务1: 素材重复上传检测
- 上传接口支持 file_hash 参数，通过 MD5+素材库ID 去重
- 命中去重直接返回已有 asset_id，不重复存 OSS
- file_hash 透传: API → IngestJob → Asset 全链路
- 三条上传路径（表单/直传/分片）均支持去重
- Alembic 031: assets + ingest_jobs 加 file_hash 列+索引
- 6 个单元测试覆盖去重命中/未命中/空hash/透传

任务3: 批量生成视频
- POST /generations 支持 count 参数，一次创建多条生成任务
- 每条任务独立状态跟踪，响应返回 task_ids 列表

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/api/app/api/routes/chunked_upload.py

@@ -19,6 +19,7 @@ from app.core.celery_app import celery_app
 from app.core.storage import OSSStorageService, get_storage_service
 from app.dependencies import (
     get_asset_library_repository,
+    get_asset_repository,
     get_ingest_job_repository,
     get_project_repository,
 )
@@ -360,6 +361,7 @@ async def complete_chunked_upload(
     authenticated_user: AuthenticatedUser = Depends(get_current_user),
     project_repository: Any = Depends(get_project_repository),
     asset_library_repository: Any = Depends(get_asset_library_repository),
+    asset_repository: Any = Depends(get_asset_repository),
     ingest_job_repository: Any = Depends(get_ingest_job_repository),
     storage_service: OSSStorageService = Depends(get_storage_service),
 ) -> ChunkedUploadCompleteResponse:
@@ -423,6 +425,29 @@ async def complete_chunked_upload(
             content_type=meta["content_type"],
         )
 
+        # ── 素材去重检测：同素材库 + 同 file_hash 视为重复 ──
+        if request.file_hash:
+            existing = asset_repository.find_by_library_and_file_hash(
+                library_id=request.library_id,
+                file_hash=request.file_hash,
+            )
+            if existing is not None:
+                logger.info(
+                    "素材去重命中(chunked): library=%s hash=%s existing_asset=%s",
+                    request.library_id,
+                    request.file_hash,
+                    existing.id,
+                )
+                meta["status"] = "completed"
+                _save_upload_meta(upload_id, meta)
+                return ChunkedUploadCompleteResponse(
+                    storage_key=storage_key,
+                    ingest_job_id="",
+                    url=file_url,
+                    duplicated=True,
+                    asset_id=existing.id,
+                )
+
         # Create ingest job
         use_case = SubmitIngestJobUseCase(ingest_job_repository)
         job = use_case.execute(
@@ -430,6 +455,7 @@ async def complete_chunked_upload(
                 project_id=meta["project_id"],
                 library_id=meta["library_id"],
                 storage_key=storage_key,
+                file_hash=request.file_hash,
             )
         )
         celery_app.send_task("worker.ingest_asset", args=[job.id])

apps/api/app/api/routes/generation_tasks.py

@@ -14,6 +14,7 @@ from app.schemas.generated_video import (
     ListGeneratedVideosResponse,
 )
 from app.schemas.generation_task import (
+    BatchGenerationTaskResponse,
     CreateGenerationTaskRequest,
     GenerationTaskResponse,
     ListGenerationTasksResponse,
@@ -122,7 +123,7 @@ def _resolve_project_and_library(
     return project_id, asset_library_id
 
 
-@router.post("/tasks", response_model=GenerationTaskResponse)
+@router.post("/tasks", response_model=BatchGenerationTaskResponse)
 def create_generation_task(
     request: CreateGenerationTaskRequest,
     authenticated_user: AuthenticatedUser = Depends(get_current_user),
@@ -130,7 +131,7 @@ def create_generation_task(
     project_repository: Any = Depends(get_project_repository),
     asset_library_repository: Any = Depends(get_asset_library_repository),
     asset_repository: Any = Depends(get_asset_repository),
-) -> GenerationTaskResponse:
+) -> BatchGenerationTaskResponse:
     project_id, asset_library_id = _resolve_project_and_library(
         request, project_repository, asset_library_repository, asset_repository, authenticated_user
     )
@@ -145,22 +146,29 @@ def create_generation_task(
         _ensure_library_has_ready_video_assets(assets)
 
     use_case = CreateGenerationTaskUseCase(generation_task_repository)
-    task = use_case.execute(
-        CreateGenerationTaskCommand(
-            project_id=project_id,
-            asset_library_id=asset_library_id,
-            strategy_id=request.strategy_id,
-            voice_library_id=request.voice_library_id,
-            template_id=request.template_id,
-            asset_ids=request.asset_ids,
-            title_ids=request.title_ids,
-            voice_ids=request.voice_ids,
-            created_by_user_id=authenticated_user.user.id,
-            source_edit_plan_id=request.source_edit_plan_id,
+    count = request.count
+    created_tasks = []
+
+    for _ in range(count):
+        task = use_case.execute(
+            CreateGenerationTaskCommand(
+                project_id=project_id,
+                asset_library_id=asset_library_id,
+                strategy_id=request.strategy_id,
+                voice_library_id=request.voice_library_id,
+                template_id=request.template_id,
+                asset_ids=request.asset_ids,
+                title_ids=request.title_ids,
+                voice_ids=request.voice_ids,
+                created_by_user_id=authenticated_user.user.id,
+                source_edit_plan_id=request.source_edit_plan_id,
+            )
         )
-    )
-    celery_app.send_task("worker.generate_video", args=[task.id])
-    return _to_generation_task_response(task)
+        celery_app.send_task("worker.generate_video", args=[task.id])
+        created_tasks.append(task)
+
+    items = [_to_generation_task_response(t) for t in created_tasks]
+    return BatchGenerationTaskResponse(items=items, total=len(items))
 
 
 @router.get("/tasks", response_model=ListGenerationTasksResponse)

apps/api/app/api/routes/upload.py

@@ -8,6 +8,7 @@ from app.core.celery_app import celery_app
 from app.core.storage import OSSStorageService, get_storage_service
 from app.dependencies import (
     get_asset_library_repository,
+    get_asset_repository,
     get_ingest_job_repository,
     get_project_repository,
 )
@@ -99,6 +100,7 @@ def _submit_ingest_job(
     library_id: str,
     storage_key: str,
     ingest_job_repository: Any,
+    file_hash: str = "",
 ) -> Any:
     use_case = SubmitIngestJobUseCase(ingest_job_repository)
     job = use_case.execute(
@@ -106,6 +108,7 @@ def _submit_ingest_job(
             project_id=project_id,
             library_id=library_id,
             storage_key=storage_key,
+            file_hash=file_hash,
         )
     )
     celery_app.send_task("worker.ingest_asset", args=[job.id])
@@ -176,6 +179,7 @@ async def complete_direct_upload(
     ingest_job_repository: Any = Depends(get_ingest_job_repository),
     project_repository: Any = Depends(get_project_repository),
     asset_library_repository: Any = Depends(get_asset_library_repository),
+    asset_repository: Any = Depends(get_asset_repository),
     storage_service: OSSStorageService = Depends(get_storage_service),
 ) -> DirectUploadCompleteResponse:
     """确认浏览器直传完成并创建导入任务。"""
@@ -199,11 +203,32 @@ async def complete_direct_upload(
     if not file_exists:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Uploaded file not found")
 
+    # ── 素材去重检测：同素材库 + 同 file_hash 视为重复 ──
+    if request.file_hash:
+        existing = asset_repository.find_by_library_and_file_hash(
+            library_id=request.library_id,
+            file_hash=request.file_hash,
+        )
+        if existing is not None:
+            logger.info(
+                "素材去重命中: library=%s hash=%s existing_asset=%s",
+                request.library_id,
+                request.file_hash,
+                existing.id,
+            )
+            return DirectUploadCompleteResponse(
+                storage_key=normalized_key,
+                ingest_job_id="",
+                duplicated=True,
+                asset_id=existing.id,
+            )
+
     job = _submit_ingest_job(
         project_id=request.project_id,
         library_id=request.library_id,
         storage_key=normalized_key,
         ingest_job_repository=ingest_job_repository,
+        file_hash=request.file_hash,
     )
     return DirectUploadCompleteResponse(storage_key=normalized_key, ingest_job_id=job.id)
 
@@ -218,15 +243,38 @@ async def upload_asset(
     project_id: str = Form(..., min_length=1, description="项目 ID"),
     library_id: str = Form(..., min_length=1, description="素材库 ID"),
     file: UploadFile = File(..., description="要上传的文件（视频、音频、图片等）"),
+    file_hash: str = Form(default="", description="文件 MD5 哈希，用于去重检测"),
     authenticated_user: AuthenticatedUser = Depends(get_current_user),
     ingest_job_repository: Any = Depends(get_ingest_job_repository),
     project_repository: Any = Depends(get_project_repository),
     asset_library_repository: Any = Depends(get_asset_library_repository),
+    asset_repository: Any = Depends(get_asset_repository),
     storage_service: OSSStorageService = Depends(get_storage_service),
 ) -> UploadAssetResponse:
     """上传素材文件并触发导入流水线。"""
     _require_project_and_library(project_id, library_id, project_repository, asset_library_repository)
 
+    # ── 素材去重检测：上传前检查同素材库 + 同 file_hash ──
+    if file_hash:
+        existing = asset_repository.find_by_library_and_file_hash(
+            library_id=library_id,
+            file_hash=file_hash,
+        )
+        if existing is not None:
+            logger.info(
+                "素材去重命中(multipart): library=%s hash=%s existing_asset=%s",
+                library_id,
+                file_hash,
+                existing.id,
+            )
+            return UploadAssetResponse(
+                storage_key=existing.storage_key,
+                ingest_job_id="",
+                url="",
+                duplicated=True,
+                asset_id=existing.id,
+            )
+
     # P2-5: 服务端验证 MIME 类型
     validated_content_type = _validate_mime_type(file.content_type)
 
@@ -255,6 +303,7 @@ async def upload_asset(
         library_id=library_id,
         storage_key=storage_key,
         ingest_job_repository=ingest_job_repository,
+        file_hash=file_hash,
     )
 
     return UploadAssetResponse(