使用缓存通讯录内容，优化性能

utils/wechat/message_to_db.py

@@ -9,6 +9,7 @@ from db.connection import DBConnectionManager
 from db.message_storage import MessageStorageDB
 # 导入积分系统
 from db.points_db import PointsDBOperator, PointSource
+from utils.wechat.contact_manager import ContactManager
 from wechat_ipad import WechatAPIClient
 from wechat_ipad.models.message import WxMessage, MessageType
 
@@ -253,11 +254,14 @@ class MessageStorage:
 
             # 格式化输出字符串，添加emoji和美化格式
             ranking_str = f"🏆 {yesterday} 发言排行榜 🏆\n"
+
+            con = ContactManager.get_instance()
             # 为不同名次添加不同的奖杯和样式，并发放积分
             for rank, result in enumerate(results, start=1):
                 username = result['wx_id']
                 speech_count = result['speech_count']
-                display_name = await self.client.get_chatroom_nickname(username, groupId)
+                display_name = con.get_group_name(groupId, username) or username
+                # display_name = await self.client.get_chatroom_nickname(username, groupId)
                 if isinstance(display_name, str):
                     display_name = display_name
                 else: