fix: WeCom sender_name shows user ID instead of actual username

- Add get_user_info() to WecomClient to fetch user name via /user/get API
- Update WecomEventConverter.target2yiri to accept bot param and fetch real user name
- Update register_listener call to pass self.bot for user name lookup
- URL-encode userid parameter for safety

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

src/langbot/libs/wecom_api/api.py

@@ -4,6 +4,7 @@ import base64
 import binascii
 import httpx
 import traceback
+from urllib.parse import quote
 from quart import Quart
 import xml.etree.ElementTree as ET
 from typing import Callable, Dict, Any
@@ -67,6 +68,31 @@ class WecomClient:
                 await self.logger.error(f'获取accesstoken失败:{response.json()}')
                 raise Exception(f'未获取access token: {data}')
 
+    async def get_user_info(self, userid: str) -> dict:
+        """
+        Get user information by user ID using the contacts secret.
+
+        Args:
+            userid: The user ID to look up.
+
+        Returns:
+            dict: User information including 'name' field.
+        """
+        if not await self.check_access_token_for_contacts():
+            self.access_token_for_contacts = await self.get_access_token(self.secret_for_contacts)
+
+        url = self.base_url + '/user/get?access_token=' + self.access_token_for_contacts + '&userid=' + quote(userid)
+        async with httpx.AsyncClient() as client:
+            response = await client.get(url)
+            data = response.json()
+            if data.get('errcode') == 40014 or data.get('errcode') == 42001:
+                self.access_token_for_contacts = await self.get_access_token(self.secret_for_contacts)
+                return await self.get_user_info(userid)
+            if data.get('errcode', 0) != 0:
+                await self.logger.error(f'获取用户信息失败:{data}')
+                return {}
+            return data
+
     async def get_users(self):
         if not self.check_access_token_for_contacts():
             self.access_token_for_contacts = await self.get_access_token(self.secret_for_contacts)