fix: move validate_video_output to module-level import + patch in render_adapter tests

- Move 'from video_processing.video_validation import validate_video_output'
  from local import inside _do_render() to module-level import
- Add autouse pytest fixture in test_render_adapter.py to mock
  validate_video_output (mock renders don't create real files)
- Fixes CI Unit Tests failure where test_successful_render failed
  because validation checked for non-existent mock output file
- 13713 tests all pass

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
@@ -532,7 +533,6 @@ class RenderAdapter:
         result = render_svc.render()
 
         # 4.5 渲染后校验输出完整性
-        from video_processing.video_validation import validate_video_output
 
         validation = validate_video_output(result.output_path)
         if not validation.valid:

tests/unit/test_render_adapter.py

@@ -4,6 +4,7 @@
 """
 
 from __future__ import annotations
+import pytest
 
 from dataclasses import dataclass, field
 from pathlib import Path
@@ -114,6 +115,18 @@ def _make_adapter(
     return adapter, mock_plan_repo, mock_clip_repo
 
 
+@pytest.fixture(autouse=True)
+def _patch_validation():
+    """Mock video validation to always pass in tests (mock renders don't create real files)."""
+    from video_processing.video_validation import VideoValidationResult
+
+    with patch(
+        "video_processing.render_adapter.validate_video_output",
+        return_value=VideoValidationResult(valid=True),
+    ):
+        yield
+
+
 # ── validate_plan 测试 ───────────────────────────────────────────────────────