refactor(wechatclawbot): 渠道管理改为模块方法契约，endpoint 不再接触客户端对象

- 收消息方向保持 Telegram 模式：模块自建连接轮询网关，转发本地消息 API
- 管理方向（状态/二维码/退出/连通性）封装为 wechatclawbot_status 等模块契约方法，
  实例解析与临时客户端回退封闭在模块内部，统一返回 {success, message} dict
- 新建 NotificationChain 薄分发链，MessageChain 移除全部 clawbot 方法
- notification endpoint 改为纯 chain 调用，不再获取任何客户端对象

app/chain/message.py

@@ -1850,58 +1850,4 @@ class MessageChain(ChainBase):
             return base64.b64decode(payload)
         except Exception as e:
             logger.error(e)
-            return None
-
-    def get_wechatclawbot_client(
-            self,
-            source: Optional[str] = None,
-            fallback_source: Optional[str] = None,
-            WECHATCLAWBOT_BASE_URL: Optional[str] = None,
-            WECHATCLAWBOT_DEFAULT_TARGET: Optional[str] = None,
-            WECHATCLAWBOT_ADMINS: Optional[str] = None,
-            WECHATCLAWBOT_POLL_TIMEOUT: Optional[int] = None,
-            allow_temporary: bool = False,
-    ):
-        """获取已加载的微信 ClawBot 客户端，必要时退回到临时客户端。"""
-        source_name = str(source or "").strip() or None
-
-        client = self.run_module(
-            "wechatclawbot_client",
-            source=source,
-            fallback_source=fallback_source,
-        )
-        if client:
-            return client, None
-
-        if allow_temporary:
-            temp_client = self.run_module(
-                "wechatclawbot_temp_client",
-                source=source_name or str(fallback_source or "").strip() or None,
-                WECHATCLAWBOT_BASE_URL=WECHATCLAWBOT_BASE_URL,
-                WECHATCLAWBOT_DEFAULT_TARGET=WECHATCLAWBOT_DEFAULT_TARGET,
-                WECHATCLAWBOT_ADMINS=WECHATCLAWBOT_ADMINS,
-                WECHATCLAWBOT_POLL_TIMEOUT=WECHATCLAWBOT_POLL_TIMEOUT,
-            )
-            if temp_client:
-                return temp_client, None
-
-        if source_name:
-            return None, f"未找到名为 {source_name} 的微信 ClawBot 通知配置"
-        return None, "微信 ClawBot 通知未启用或配置尚未保存，请先保存并启用当前渠道"
-
-    def migrate_wechatclawbot_cache(
-            self,
-            old_name: str,
-            new_name: str,
-            cleanup_old: bool = False,
-            overwrite: bool = False,
-    ):
-        """在通知名称变更时迁移对应的微信 ClawBot 登录缓存。"""
-        return self.run_module(
-            "wechatclawbot_migrate_cache",
-            old_name=old_name,
-            new_name=new_name,
-            cleanup_old=cleanup_old,
-            overwrite=overwrite,
-        )
-
+            return None

app/chain/notification.py

@@ -0,0 +1,114 @@
+from typing import Any, Dict, Tuple
+
+from app.chain import ChainBase
+
+
+class NotificationChain(ChainBase):
+    """
+    通知渠道管理链，仅做模块方法名契约的薄分发，渠道连接与能力全部封闭在模块内部
+    """
+
+    def get_wechatclawbot_status(
+            self,
+            source=None,
+            fallback_source=None,
+            WECHATCLAWBOT_BASE_URL=None,
+            WECHATCLAWBOT_DEFAULT_TARGET=None,
+            WECHATCLAWBOT_ADMINS=None,
+            WECHATCLAWBOT_POLL_TIMEOUT=None,
+            refresh_remote: bool = True,
+            auto_generate_qrcode: bool = True,
+    ) -> Dict[str, Any]:
+        """查询微信 ClawBot 登录状态与二维码。"""
+        result = self.run_module(
+            "wechatclawbot_status",
+            source=source,
+            fallback_source=fallback_source,
+            WECHATCLAWBOT_BASE_URL=WECHATCLAWBOT_BASE_URL,
+            WECHATCLAWBOT_DEFAULT_TARGET=WECHATCLAWBOT_DEFAULT_TARGET,
+            WECHATCLAWBOT_ADMINS=WECHATCLAWBOT_ADMINS,
+            WECHATCLAWBOT_POLL_TIMEOUT=WECHATCLAWBOT_POLL_TIMEOUT,
+            refresh_remote=refresh_remote,
+            auto_generate_qrcode=auto_generate_qrcode,
+        )
+        return result or {"success": False, "message": "微信 ClawBot 通知未启用或配置尚未保存"}
+
+    def refresh_wechatclawbot_qrcode(
+            self,
+            source=None,
+            fallback_source=None,
+            WECHATCLAWBOT_BASE_URL=None,
+            WECHATCLAWBOT_DEFAULT_TARGET=None,
+            WECHATCLAWBOT_ADMINS=None,
+            WECHATCLAWBOT_POLL_TIMEOUT=None,
+    ) -> Dict[str, Any]:
+        """刷新微信 ClawBot 登录二维码。"""
+        result = self.run_module(
+            "wechatclawbot_refresh_qrcode",
+            source=source,
+            fallback_source=fallback_source,
+            WECHATCLAWBOT_BASE_URL=WECHATCLAWBOT_BASE_URL,
+            WECHATCLAWBOT_DEFAULT_TARGET=WECHATCLAWBOT_DEFAULT_TARGET,
+            WECHATCLAWBOT_ADMINS=WECHATCLAWBOT_ADMINS,
+            WECHATCLAWBOT_POLL_TIMEOUT=WECHATCLAWBOT_POLL_TIMEOUT,
+        )
+        return result or {"success": False, "message": "微信 ClawBot 通知未启用或配置尚未保存"}
+
+    def logout_wechatclawbot(
+            self,
+            source=None,
+            fallback_source=None,
+            WECHATCLAWBOT_BASE_URL=None,
+            WECHATCLAWBOT_DEFAULT_TARGET=None,
+            WECHATCLAWBOT_ADMINS=None,
+            WECHATCLAWBOT_POLL_TIMEOUT=None,
+    ) -> Dict[str, Any]:
+        """退出微信 ClawBot 登录。"""
+        result = self.run_module(
+            "wechatclawbot_logout",
+            source=source,
+            fallback_source=fallback_source,
+            WECHATCLAWBOT_BASE_URL=WECHATCLAWBOT_BASE_URL,
+            WECHATCLAWBOT_DEFAULT_TARGET=WECHATCLAWBOT_DEFAULT_TARGET,
+            WECHATCLAWBOT_ADMINS=WECHATCLAWBOT_ADMINS,
+            WECHATCLAWBOT_POLL_TIMEOUT=WECHATCLAWBOT_POLL_TIMEOUT,
+        )
+        return result or {"success": False, "message": "微信 ClawBot 通知未启用或配置尚未保存"}
+
+    def test_wechatclawbot_connection(
+            self,
+            source=None,
+            fallback_source=None,
+            WECHATCLAWBOT_BASE_URL=None,
+            WECHATCLAWBOT_DEFAULT_TARGET=None,
+            WECHATCLAWBOT_ADMINS=None,
+            WECHATCLAWBOT_POLL_TIMEOUT=None,
+    ) -> Dict[str, Any]:
+        """测试微信 ClawBot 当前登录态是否可用。"""
+        result = self.run_module(
+            "wechatclawbot_test_connection",
+            source=source,
+            fallback_source=fallback_source,
+            WECHATCLAWBOT_BASE_URL=WECHATCLAWBOT_BASE_URL,
+            WECHATCLAWBOT_DEFAULT_TARGET=WECHATCLAWBOT_DEFAULT_TARGET,
+            WECHATCLAWBOT_ADMINS=WECHATCLAWBOT_ADMINS,
+            WECHATCLAWBOT_POLL_TIMEOUT=WECHATCLAWBOT_POLL_TIMEOUT,
+        )
+        return result or {"success": False, "message": "微信 ClawBot 通知未启用或配置尚未保存"}
+
+    def migrate_wechatclawbot_cache(
+            self,
+            old_name: str,
+            new_name: str,
+            cleanup_old: bool = False,
+            overwrite: bool = False,
+    ) -> Tuple[bool, str]:
+        """在通知名称变更时迁移对应的微信 ClawBot 登录缓存。"""
+        result = self.run_module(
+            "wechatclawbot_migrate_cache",
+            old_name=old_name,
+            new_name=new_name,
+            cleanup_old=cleanup_old,
+            overwrite=overwrite,
+        )
+        return result or (False, "微信 ClawBot 通知未启用")