feat: 渲染失败检测+任务超时机制 (#1219)

- 新增 video_validation 模块（moov atom 检测 + ffprobe 验证 + 退出码映射）
- render_adapter 渲染后自动校验输出再上传 OSS
- 三个渲染任务加 10 分钟 soft_time_limit
- Worker 启动时清理 GenerationTask + Job 两张表的孤儿任务
- 21 个新单元测试，全量 13713 测试通过

apps/worker/video_processing/render_adapter.py

@@ -25,6 +25,7 @@ from typing import Any, Callable
 from sqlalchemy.orm import Session
 from video_processing.oss_helpers import download_asset, upload_to_oss
 from video_processing.unified_render_service import UnifiedRenderService
+from video_processing.video_validation import validate_video_output
 
 from packages.adapters.sqlalchemy_impl.edit_plan_clip_repository import SQLAlchemyEditPlanClipRepository
 from packages.adapters.sqlalchemy_impl.edit_plan_repository import SQLAlchemyEditPlanRepository
@@ -531,6 +532,22 @@ class RenderAdapter:
         )
         result = render_svc.render()
 
+        # 4.5 渲染后校验输出完整性
+
+        validation = validate_video_output(result.output_path)
+        if not validation.valid:
+            logger.error(
+                "[render-adapter] 渲染输出校验失败: plan_id=%s job_id=%s error=%s",
+                plan_id,
+                job_id,
+                validation.error_message,
+            )
+            return RenderAdapterResult(
+                success=False,
+                error_message=f"渲染输出校验失败: {validation.error_message}",
+                error_detail=validation.error_message,
+            )
+
         self._report_progress(progress_cb, 80.0, "上传渲染结果")
 
         # 5. 上传结果