fix: Pipeline 处理添加耗时日志和异常捕获

- message_pipeline.handle_message 添加每步耗时日志（租户解析/会话管理/消息处理）
- feishu_longconn_service Pipeline 调用包裹 try/catch，异常时记录完整堆栈
- feishu_bot.py 同样添加 Pipeline 异常捕获
- 防止 Pipeline 内部异常被静默吞掉导致消息无回复

src/web/blueprints/feishu_bot.py

@@ -119,15 +119,20 @@ def _process_message_in_background(app, event_data: dict):
             logger.info(f"[Feishu Bot] 发送者={sender_name}({sender_id}), 群={chat_id}, 租户={tenant_id}")
 
             # 4. 使用 Pipeline 统一处理消息
-            pipeline = service_manager.get_pipeline()
-            response_data = pipeline.handle_message(
-                user_id=user_id,
-                message=text_content,
-                tenant_id=tenant_id,
-                chat_id=chat_id,
-                ip_address=f"feishu:{sender_id}:{sender_name}",
-                invocation_method=f"feishu_bot({chat_type})"
-            )
+            try:
+                pipeline = service_manager.get_pipeline()
+                logger.info(f"[Feishu Bot] Pipeline 开始处理: user={user_id}")
+                response_data = pipeline.handle_message(
+                    user_id=user_id,
+                    message=text_content,
+                    tenant_id=tenant_id,
+                    chat_id=chat_id,
+                    ip_address=f"feishu:{sender_id}:{sender_name}",
+                    invocation_method=f"feishu_bot({chat_type})"
+                )
+            except Exception as pipe_err:
+                logger.error(f"[Feishu Bot] Pipeline 处理异常: {pipe_err}", exc_info=True)
+                response_data = {"success": False, "error": str(pipe_err)}
             logger.info(f"[Feishu Bot] 处理结果: success={response_data.get('success')}")
 
             # 5. 提取回复并发送