fix: 确认生成 API 改为复用 worker.generate_video 渲染路径

- 新增 ConfirmGenerationRequest schema 和 POST /tasks/{task_id}/confirm 端点
- 确认生成复用 worker.generate_video 完整渲染路径（不再走 edit_plan_generation.py）
- 默认分辨率 1080x1920（竖屏），支持自定义封面和标题
- 新增字段: is_preview, source_task_id, output_width, output_height, cover_url, custom_title
- 贯穿 Schema → Domain → Application → DB Model → Repository → Worker 全链路
- 更新 task_center.py 和 generation_tasks.py 的重试逻辑传递新字段
- Alembic 迁移 034: 为 generation_tasks 表添加 6 个新列
- 7 个单元测试覆盖确认生成的正常/异常流程
- 使用 getattr 带默认值确保向后兼容

packages/adapters/sqlalchemy_impl/generation_task_repository.py

@@ -27,6 +27,12 @@ def _to_domain(model: GenerationTaskModel) -> GenerationTask:
         source_edit_plan_id=model.source_edit_plan_id or "",
         asset_select_mode=model.asset_select_mode or "",
         batch_id=model.batch_id or "",
+        is_preview=getattr(model, 'is_preview', True),
+        source_task_id=getattr(model, 'source_task_id', '') or "",
+        output_width=getattr(model, 'output_width', 1280) or 1280,
+        output_height=getattr(model, 'output_height', 720) or 720,
+        cover_url=getattr(model, 'cover_url', '') or "",
+        custom_title=getattr(model, 'custom_title', '') or "",
         created_at=model.created_at,
     )
 
@@ -56,6 +62,12 @@ class SQLAlchemyGenerationTaskRepository:
             source_edit_plan_id=task.source_edit_plan_id or None,
             asset_select_mode=task.asset_select_mode or "",
             batch_id=task.batch_id or "",
+            is_preview=task.is_preview,
+            source_task_id=task.source_task_id or "",
+            output_width=task.output_width,
+            output_height=task.output_height,
+            cover_url=task.cover_url or "",
+            custom_title=task.custom_title or "",
             created_at=task.created_at,
         )
         self.session.add(model)
@@ -129,5 +141,11 @@ class SQLAlchemyGenerationTaskRepository:
         model.source_edit_plan_id = task.source_edit_plan_id or None
         model.asset_select_mode = task.asset_select_mode or ""
         model.batch_id = task.batch_id or ""
+        model.is_preview = task.is_preview
+        model.source_task_id = task.source_task_id or ""
+        model.output_width = task.output_width
+        model.output_height = task.output_height
+        model.cover_url = task.cover_url or ""
+        model.custom_title = task.custom_title or ""
         self.session.commit()
         return task

packages/adapters/sqlalchemy_impl/models.py

@@ -255,6 +255,12 @@ class GenerationTaskModel(Base):
     source_edit_plan_id = Column(String(32), nullable=True, index=True)
     asset_select_mode = Column(String(20), nullable=False, default="")
     batch_id = Column(String(32), nullable=False, default="", index=True)
+    is_preview = Column(Boolean, nullable=False, default=True)
+    source_task_id = Column(String(32), nullable=False, default="", index=True)
+    output_width = Column(Integer, nullable=False, default=1280)
+    output_height = Column(Integer, nullable=False, default=720)
+    cover_url = Column(String(1000), nullable=False, default="")
+    custom_title = Column(String(500), nullable=False, default="")
     extra_meta = Column("metadata", JSON, nullable=False, default=dict)
     created_at = Column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))