fix: 企微 API 通过代理绕过 IP 白名单限制，补充错误日志

- 新增 WECHAT_API_BASE_URL 配置项，支持企微 API 代理转发
- _send_message 增加 API 错误日志（errcode + errmsg）
- _get_access_token 增加失败日志
- handle_text 不再为空，返回菜单引导提示
- 防重入触发时通知用户等待时间
- menu.py API 调用统一使用配置化的 base URL

Co-Authored-By: Claude <noreply@anthropic.com>

app/wechat/client.py

@@ -1,9 +1,12 @@
+import logging
 import time
 
 import httpx
 
 from app.config import settings
 
+logger = logging.getLogger(__name__)
+
 
 class WeChatClient:
     def __init__(self):
@@ -15,7 +18,7 @@ class WeChatClient:
         if self._access_token and now < self._token_expires_at:
             return self._access_token
 
-        url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken"
+        url = f"{settings.wechat_api_base_url}/cgi-bin/gettoken"
         params = {
             "corpid": settings.wechat_corp_id,
             "corpsecret": settings.wechat_secret,
@@ -27,6 +30,7 @@ class WeChatClient:
                 self._access_token = data["access_token"]
                 self._token_expires_at = now + data.get("expires_in", 7200) - 300
                 return self._access_token
+            logger.error(f"获取 access_token 失败: {data}")
         return None
 
     async def send_text(self, content: str, to_user: str = "@all") -> bool:
@@ -59,9 +63,10 @@ class WeChatClient:
     ) -> bool:
         token = await self._get_access_token()
         if not token:
+            logger.error("无法获取 access_token，跳过消息发送")
             return False
 
-        url = "https://qyapi.weixin.qq.com/cgi-bin/message/send"
+        url = f"{settings.wechat_api_base_url}/cgi-bin/message/send"
         params = {"access_token": token}
         body = {
             "touser": to_user,
@@ -73,4 +78,11 @@ class WeChatClient:
         async with httpx.AsyncClient(timeout=30) as client:
             response = await client.post(url, params=params, json=body)
             data = response.json()
-            return data.get("errcode") == 0
+            errcode = data.get("errcode")
+            if errcode == 0:
+                return True
+            logger.error(
+                f"企业微信消息发送失败: errcode={errcode} errmsg={data.get('errmsg')} "
+                f"msgtype={msgtype} touser={to_user}"
+            )
+            return False