导入方式修改

backend/app/main_graph/nodes/_utils.py

@@ -4,12 +4,13 @@
 """
 
 from typing import Dict, Any, Optional
+from langchain_core.runnables.config import RunnableConfig
 
 
 async def dispatch_custom_event(
     event_name: str,
     data: Dict[str, Any],
-    config: Optional[Dict[str, Any]] = None,
+    config: Optional[RunnableConfig] = None,
 ) -> None:
     """
     安全地发送自定义事件，忽略发送失败