优化代码，删除无效代码

plugins/weather/main.py

@@ -47,10 +47,6 @@ class WeatherPlugin(MessagePluginInterface):
         self.LOG = logger
         self.LOG.info(f"正在初始化 {self.name} 插件...")
 
-        # 保存上下文对象
-        self.event_system = context.get("event_system")
-        self.message_util = context.get("message_util")
-
         # 从TOML配置文件加载配置
         self._commands = self._config.get("Weather", {}).get("command", ["天气"])
         self.command_format = self._config.get("Weather", {}).get("command-format", """⚙️获取天气：