chore/ 删除无用文件

api/app/agents/chat/helpers.py

@@ -1,4 +1,5 @@
 """聊天 Agent 共享工具：历史获取、格式化、存储"""
+
 from datetime import datetime
 from typing import Any, List
 
@@ -45,5 +46,7 @@ async def save_message(
         content,
         message_type=message_type,
         voice_session_id=voice_session_id,
-        timestamp=timestamp.isoformat() if isinstance(timestamp, datetime) else timestamp,
+        timestamp=timestamp.isoformat()
+        if isinstance(timestamp, datetime)
+        else timestamp,
     )