refactor: unify core pipeline logging with cs_agent logger

core/message_orchestrator.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import asyncio
+import logging
 from typing import Any
 
 from core.ai_reply_flow import execute_ai_turn
@@ -11,6 +12,8 @@ from core.reply_finalize_flow import finalize_ai_reply
 from utils.metrics_tracker import emit as metrics_emit
 from utils.observability import build_trace_id
 
+logger = logging.getLogger("cs_agent")
+
 
 async def process_incoming_message(agent: Any, message: Any) -> Any:
     """主消息处理编排：预处理 -> 业务流 -> AI -> 收尾。"""
@@ -72,7 +75,7 @@ async def process_incoming_message(agent: Any, message: Any) -> Any:
         )
     except Exception as e:
         err_str = str(e)
-        print(f"[Agent] AI 调用失败: {e}，使用兜底回复")
+        logger.exception("[Agent] AI 调用失败，使用兜底回复: %s", err_str)
         agent._activity_log("agent_ai_error", customer_id=message.from_id, acc_id=message.acc_id, error=err_str)
         metrics_emit("ai_call_failed", customer_id=message.from_id, acc_id=message.acc_id)
         if "AccountOverdueError" in err_str or "overdue" in err_str.lower():