feat: Enable core to use local config files while being managed via the web (#1540)

easytier/locales/app.yml

@@ -18,6 +18,9 @@ core_clap:
   config_file:
     en: "path to the config file, NOTE: the options set by cmdline args will override options in config file"
     zh-CN: "配置文件路径，注意：命令行中的配置的选项会覆盖配置文件中的选项"
+  config_dir:
+    en: "Load all .toml files in the directory to start network instances, and store the received configurations in this directory."
+    zh-CN: "加载目录中的所有 .toml 文件以启动网络实例，并将下发的配置保存在此目录中。"
   generate_completions:
     en: "generate shell completions"
     zh-CN: "生成 shell 补全脚本"