fix: Pipeline 初始化改为后台线程，不阻塞飞书长连接启动

- Pipeline 预初始化移到后台线程（不阻塞 FeishuLongConnService.__init__）
- 消息处理时等待 Pipeline 就绪（最多 10 秒），超时则即时初始化
- Redis socket_connect_timeout 从 2s 降为 1s
- 解决 Redis 连接慢导致整个飞书服务卡死的问题

src/core/session_store.py

@@ -187,10 +187,11 @@ def create_session_store() -> SessionStore:
                 password=config.redis.password,
                 db=config.redis.db,
                 decode_responses=True,
-                socket_connect_timeout=2,
-                socket_timeout=2
+                socket_connect_timeout=1,
+                socket_timeout=1
             )
             client.ping()
+            logger.info(f"会话存储使用 Redis ({config.redis.host})")
             return RedisSessionStore(client)
     except Exception as e:
         logger.info(f"Redis 不可用（{e}），会话存储使用内存")

src/integrations/feishu_longconn_service.py

@@ -55,13 +55,16 @@ class FeishuLongConnService:
         self._executor = ThreadPoolExecutor(max_workers=5, thread_name_prefix="feishu_msg")
         self._msg_count = 0
 
-        # 预初始化 Pipeline（避免首条消息时懒加载导致超时）
+        # 预初始化 Pipeline（在后台线程，不阻塞启动）
+        self._pipeline = None
+        def _init_pipeline():
             try:
                 self._pipeline = service_manager.get_pipeline()
                 logger.info("✅ MessagePipeline 预初始化成功")
             except Exception as e:
                 logger.error(f"❌ MessagePipeline 预初始化失败: {e}", exc_info=True)
-            self._pipeline = None
+        import threading as _threading
+        _threading.Thread(target=_init_pipeline, daemon=True).start()
 
     def _handle_message(self, data: P2ImMessageReceiveV1) -> None:
         """收到消息事件，立即提交到线程池，确保 SDK 回调快速返回"""
@@ -176,8 +179,16 @@ class FeishuLongConnService:
             # 使用 Pipeline 统一处理消息
             session_user_id = f"feishu_{chat_id}_{sender_id}"
             try:
-                logger.info(f"正在获取 Pipeline...")
-                pipeline = self._pipeline or service_manager.get_pipeline()
+                # 等待 Pipeline 就绪（最多 10 秒）
+                import time as _wait_time
+                for _ in range(100):
+                    if self._pipeline:
+                        break
+                    _wait_time.sleep(0.1)
+                pipeline = self._pipeline
+                if not pipeline:
+                    logger.warning("Pipeline 未就绪，尝试即时初始化")
+                    pipeline = service_manager.get_pipeline()
                 logger.info(f"Pipeline 开始处理: user={session_user_id}")
                 response_data = pipeline.handle_message(
                     user_id=session_user_id,