fix: global plugin read encoding

plugins/plugin.py

@@ -19,7 +19,7 @@ class Plugin:
             # 全局配置不存在 或者 未开启全局配置开关，则获取插件目录下的配置
             plugin_config_path = os.path.join(self.path, "config.json")
             if os.path.exists(plugin_config_path):
-                with open(plugin_config_path, "r") as f:
+                with open(plugin_config_path, "r", encoding="utf-8") as f:
                     plugin_conf = json.load(f)
         logger.debug(f"loading plugin config, plugin_name={self.name}, conf={plugin_conf}")
         return plugin_conf