fix(worker): 修复EditPlan渲染路径配音临时文件泄漏

_render_from_edit_plan 现在返回 voiceover_path，generate_video
在渲染完成、上传OSS后清理临时配音文件，避免磁盘泄漏。

新增 order=0 边界测试。

apps/worker/worker_app/tasks/generation.py

@@ -1295,7 +1295,7 @@ def _render_from_edit_plan(
     """从 EditPlan 数据库记录直接渲染（不再内存重建clips）。
 
     Returns:
-        (output_path, render_duration, cover_candidates)
+        (output_path, render_duration, cover_candidates, voiceover_path)
     """
     from video_processing.render_adapter import RenderAdapter
     from worker_app.db import SessionLocal
@@ -1335,11 +1335,9 @@ def _render_from_edit_plan(
         output_path = result.output_path
         cover_candidates = getattr(result, "cover_candidates", None)
 
-        return output_path, result.duration, cover_candidates
+        return output_path, result.duration, cover_candidates, voiceover_path
     finally:
         db.close()
-        # 清理临时配音文件
-        # voiceover_path 在外部作用域，这里不直接引用
 
 
 def generate_video(self, task_id: str) -> dict:
@@ -1439,7 +1437,7 @@ def generate_video(self, task_id: str) -> dict:
                 gen_task.append_log("渲染模式", "从草稿数据渲染（与预览一致）")
                 _flush_logs(task_id, gen_task)
 
-            output_path, render_duration, cover_candidates = _render_from_edit_plan(
+            output_path, render_duration, cover_candidates, voiceover_tmp_path = _render_from_edit_plan(
                 task_id=task_id,
                 source_edit_plan_id=source_edit_plan_id,
                 task_info=task_info,
@@ -1587,6 +1585,13 @@ def generate_video(self, task_id: str) -> dict:
                 file_size,
             )
 
+            # 清理临时配音文件
+            if voiceover_tmp_path:
+                try:
+                    Path(voiceover_tmp_path).unlink(missing_ok=True)
+                except OSError:
+                    logger.warning("[task_id=%s] 清理临时配音文件失败: %s", task_id, voiceover_tmp_path)
+
             return {
                 "status": "completed",
                 "task_id": task_id,

tests/unit/test_batch_clips_endpoint.py

@@ -110,6 +110,34 @@ class TestBatchUpdateClips:
         assert clips_data[0]["start_time"] == 0.0
         assert clips_data[0]["duration"] == 3.0
 
+    def test_batch_update_order_zero_preserved(self, mock_services):
+        """order=0 是合法值，不能被 or 表达式误覆盖为循环索引。"""
+        from app.api.routes.templates_editor.draft import batch_update_clips
+        from app.api.routes.templates_editor.schemas import (
+            EditorClipBatchItem,
+            EditorClipBatchUpdateRequest,
+        )
+
+        _, plan_svc = mock_services
+        req = EditorClipBatchUpdateRequest(
+            clips=[
+                EditorClipBatchItem(asset_id="a1", start_time=0.0, duration=3.0, order=0),
+                EditorClipBatchItem(asset_id="a2", start_time=3.0, duration=5.0, order=1),
+            ]
+        )
+
+        batch_update_clips(
+            template_id="tpl-1",
+            req=req,
+            plan_id="plan-1",
+            services=mock_services,
+            _=MagicMock(),
+        )
+
+        clips_data = plan_svc.replace_all_clips_transactional.call_args[0][1]
+        assert clips_data[0]["order"] == 0
+        assert clips_data[1]["order"] == 1
+
 
 class TestEditorClipBatchItemValidation:
     """验证 schema 校验规则。"""