fix:[FL-143][处理消息查看报错]

Co-authored-by: multica-agent <github@multica.ai>

api/app/schemas/system_message.py

@@ -1,10 +1,12 @@
 from datetime import datetime
 from typing import Literal
 
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, ConfigDict, Field
 
 
 class SystemMessagePublic(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
     id: str
     title: str
     content: str