fix: list_collections 异常向上传播而非静默吞掉

src/server/app.py

@@ -106,7 +106,11 @@ def list_collections(
     state: AppState = Depends(get_state),
     _: bool = Depends(verify_api_key),
 ):
-    return {"collections": state.list_collections_with_stats()}
+    try:
+        return {"collections": state.list_collections_with_stats()}
+    except Exception:
+        logger.exception("列出集合失败")
+        raise HTTPException(status_code=500, detail="服务器内部错误")
 
 
 @app.post("/api/v1/ingest")