debug: lipsync 路由增加详细错误暴露，定位 staging 500 根因

- _get_service 依赖注入加 try/except，暴露 LipsyncService 初始化错误
- list_lipsync_jobs 加 try/except，暴露 DB 查询错误
- 错误信息包含异常类型和详情，方便 staging 实测定位

apps/api/app/api/routes/lipsync.py

@@ -31,7 +31,14 @@ def _get_service(
     db: Session = Depends(get_db_session),
     cosyvoice_service: CosyVoiceService = Depends(get_cosyvoice_service),
 ) -> LipsyncService:
-    return LipsyncService(db, cosyvoice_service=cosyvoice_service)
+    try:
+        return LipsyncService(db, cosyvoice_service=cosyvoice_service)
+    except Exception as exc:
+        logger.error("LipsyncService 初始化失败: %s", exc, exc_info=True)
+        raise HTTPException(
+            status_code=500,
+            detail=f"LipsyncService init: {type(exc).__name__}: {exc}",
+        ) from exc
 
 
 def _resolve_voice_id(
@@ -129,13 +136,20 @@ def list_lipsync_jobs(
     svc: LipsyncService = Depends(_get_service),
 ):
     """获取对口型任务列表."""
-    items, total = svc.list_jobs(
-        user_id=current_user.id,
-        project_id=project_id,
-        status=status,
-        offset=offset,
-        limit=limit,
-    )
+    try:
+        items, total = svc.list_jobs(
+            user_id=current_user.id,
+            project_id=project_id,
+            status=status,
+            offset=offset,
+            limit=limit,
+        )
+    except Exception as exc:
+        logger.error("list_jobs 查询失败: %s", exc, exc_info=True)
+        raise HTTPException(
+            status_code=500,
+            detail=f"list_jobs error: {type(exc).__name__}: {exc}",
+        ) from exc
     return {
         "items": [LipsyncJobResponse.model_validate(j) for j in items],
         "total": total,