fix: delete_subtitle 204响应FastAPI断言失败

- 添加response_model=None和response_class=Response
- 修复204状态码与response body冲突的问题

apps/api/app/api/routes/edit_plans.py

@@ -673,6 +673,8 @@ def update_subtitle(
     "/clips/{clip_id}/subtitles/{subtitle_id}",
     summary="删除一条字幕",
     status_code=status.HTTP_204_NO_CONTENT,
+    response_model=None,
+    response_class=Response,
 )
 def delete_subtitle(
     clip_id: str,
@@ -707,7 +709,6 @@ def delete_subtitle(
         subtitle_id,
         current_user.user.id,
     )
-    return Response(status_code=status.HTTP_204_NO_CONTENT)
 
 
 @router.put(