优化代码，删除无效代码

plugins/group_member_change/main.py

@@ -3,12 +3,9 @@ from typing import Dict, Any, List, Optional, Tuple
 
 import xml.etree.ElementTree as ET
 
-import dacite
-
 from plugin_common.message_plugin_interface import MessagePluginInterface
 from plugin_common.plugin_interface import PluginStatus
 from utils.robot_cmd.robot_command import Feature, PermissionStatus, GroupBotManager
-from message_util import MessageUtil  # 导入消息工具类
 from wechat_ipad import WechatAPIClient
 
 
@@ -50,9 +47,6 @@ class GroupMemberChangePlugin(MessagePluginInterface):
         """初始化插件"""
         self.LOG.info(f"正在初始化 {self.name} 插件...")
 
-        # 创建消息工具实例message_util
-        self.message_util: MessageUtil = context.get("message_util")
-
         self.LOG.info(f"{self.name} 插件初始化完成")
         return True