fix: repair broken imports injected into workflow module

core/workflow.py

@@ -6,7 +6,8 @@
 - 图片AI接入点：调用 workflow.image_ai_submit_result(task_id, result_url)
 - 消息回调接口：通过 register_send_callback 注入发送函数
 """
-import asyncio`r`nimport logging
+import asyncio
+import logging
 import os
 import uuid
 from enum import Enum
@@ -14,7 +15,8 @@ from typing import Optional, Dict, Callable, Awaitable, Any, List
 from datetime import datetime
 from dataclasses import dataclass, field
 
-_WECHAT_WEBHOOK = os.getenv("WECHAT_WEBHOOK", "")`r`nlogger = logging.getLogger("cs_agent")
+_WECHAT_WEBHOOK = os.getenv("WECHAT_WEBHOOK", "")
+logger = logging.getLogger("cs_agent")
 
 
 async def _wechat_notify(content: str):