修复状态兼容性问题：让旧节点同时支持 dict 和 dataclass

backend/app/main_graph/nodes/memory_trigger.py

@@ -4,19 +4,30 @@ from app.main_graph.state import MessagesState
 from app.memory.mem0_client import Mem0Client
 from app.logger import info
 
+
+def _get_attr(state, attr_name, default=None):
+    """通用方法：兼容 dict 和 dataclass 两种状态格式"""
+    if isinstance(state, dict):
+        return state.get(attr_name, default)
+    else:
+        return getattr(state, attr_name, default)
+
+
 # 全局变量，在 GraphBuilder 中注入
 _mem0_client: Mem0Client = None
 
+
 def set_mem0_client(client: Mem0Client):
     global _mem0_client
     _mem0_client = client
 
-async def memory_trigger_node(state: MessagesState, config: RunnableConfig) -> Dict[str, Any]:
+
+async def memory_trigger_node(state, config: RunnableConfig) -> Dict[str, Any]:
     """检测用户消息中的记忆指令，若命中则主动调用 Mem0 存储"""
     if _mem0_client is None:
         return {}
 
-    messages = state.get("messages", [])
+    messages = _get_attr(state, "messages", [])
     if not messages:
         return {}