fix: 修复素材库诊断/缩略图/视频URL + 剪辑计划错误处理

Task #105: 修复剪辑计划/模板页面报服务器繁忙
- templates.py: list_templates/get_template/list_categories 加 try/except
- templates.py: 新增 POST /{template_id}/toggle-favorite 兼容端点
- edit_plans.py: list_plans 加 try/except，ai_tasks 加 ImportError 守卫

Task #106: 修复素材库诊断按钮 + 缩略图/视频URL
- asset_diagnosis.py: get_project_asset_diagnosis 加 try/except
- assets.py: 注入 storage_service，生成签名 file_url
- asset.py schema: 新增 file_url 字段
- 视频素材 thumbnail_url 为空时复用 file_url 作为封面

其他:
- edit_plans/generation_tasks 支持 source_edit_plan_id
- Alembic 迁移 022: 两表加 source_edit_plan_id 字段

packages/adapters/sqlalchemy_impl/edit_plan_repository.py

@@ -64,6 +64,7 @@ class SQLAlchemyEditPlanRepository:
             name=plan.name,
             status=plan.status,
             total_duration=plan.total_duration,
+            source_edit_plan_id=plan.source_edit_plan_id or None,
             config=plan.config,
         )
         self.session.add(model)
@@ -80,6 +81,7 @@ class SQLAlchemyEditPlanRepository:
         model.name = plan.name
         model.status = plan.status
         model.total_duration = plan.total_duration
+        model.source_edit_plan_id = plan.source_edit_plan_id or None
         model.config = plan.config
         model.updated_at = plan.updated_at
         self.session.commit()
@@ -110,6 +112,7 @@ class SQLAlchemyEditPlanRepository:
             name=model.name,
             status=EditPlanStatus(model.status) if model.status else EditPlanStatus.DRAFT,
             total_duration=model.total_duration or 0.0,
+            source_edit_plan_id=model.source_edit_plan_id or "",
             config=model.config or {},
             created_at=model.created_at,
             updated_at=model.updated_at,

packages/adapters/sqlalchemy_impl/generation_task_repository.py

@@ -23,6 +23,7 @@ def _to_domain(model: GenerationTaskModel) -> GenerationTask:
         started_at=model.started_at,
         completed_at=model.completed_at,
         created_by_user_id=model.created_by_user_id,
+        source_edit_plan_id=model.source_edit_plan_id or "",
         created_at=model.created_at,
     )
 
@@ -49,6 +50,7 @@ class SQLAlchemyGenerationTaskRepository:
             started_at=task.started_at,
             completed_at=task.completed_at,
             created_by_user_id=task.created_by_user_id,
+            source_edit_plan_id=task.source_edit_plan_id or None,
             created_at=task.created_at,
         )
         self.session.add(model)
@@ -92,6 +94,15 @@ class SQLAlchemyGenerationTaskRepository:
         )
         return [_to_domain(m) for m in models]
 
+    def list_by_source_edit_plan(self, plan_id: str) -> list[GenerationTask]:
+        models = (
+            self.session.query(GenerationTaskModel)
+            .filter(GenerationTaskModel.source_edit_plan_id == plan_id)
+            .order_by(GenerationTaskModel.created_at.desc())
+            .all()
+        )
+        return [_to_domain(m) for m in models]
+
     def update(self, task: GenerationTask) -> GenerationTask:
         model = self.session.query(GenerationTaskModel).filter(GenerationTaskModel.id == task.id).first()
         if model is None:
@@ -110,5 +121,6 @@ class SQLAlchemyGenerationTaskRepository:
         model.error_message = task.error_message
         model.started_at = task.started_at
         model.completed_at = task.completed_at
+        model.source_edit_plan_id = task.source_edit_plan_id or None
         self.session.commit()
         return task

packages/adapters/sqlalchemy_impl/models.py

@@ -119,6 +119,7 @@ class EditPlanModel(Base):
     status = Column(String(20), nullable=False, default="draft", index=True)
     total_duration = Column(Float, nullable=False, default=0.0)
     config = Column(JSON, nullable=False, default=dict)
+    source_edit_plan_id = Column(String(32), nullable=True, index=True)
     created_at = Column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
     updated_at = Column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
 
@@ -219,6 +220,7 @@ class GenerationTaskModel(Base):
     started_at = Column(DateTime, nullable=True)
     completed_at = Column(DateTime, nullable=True)
     created_by_user_id = Column(String(32), nullable=False, default="", index=True)
+    source_edit_plan_id = Column(String(32), nullable=True, index=True)
     extra_meta = Column("metadata", JSON, nullable=False, default=dict)
     created_at = Column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))