feat(gui): add service and remote mode support (#1578)

This PR fundamentally restructures the EasyTier GUI, introducing support for service mode and remote mode, transforming it from a simple desktop application into a powerful network management terminal. This change allows users to persistently run the EasyTier core as a background service or remotely manage multiple EasyTier instances, greatly improving deployment flexibility and manageability.

easytier-web/frontend-lib/src/locales/en.yaml

@@ -340,3 +340,33 @@ web:
     language: Language
     theme: Theme
     logout: Logout
+
+mode:
+  title: Mode
+  switch_mode: Switch Mode
+  config_dir: Config Dir
+  rpc_portal: RPC Portal
+  log_level: Log Level
+  log_dir: Log Dir
+  remote_rpc_address: Remote RPC Address
+  normal: Normal
+  service: Service
+  remote: Remote
+  normal_description: Run EasyTier directly, suitable for local use.
+  service_description: Run as a system service, supporting auto-startup and background operation. The service continues to run in the background after exiting the GUI.
+  remote_description: Connect to a remote RPC service to manage and control remote nodes.
+  service_status: Service Status
+  service_status_running: Running
+  service_status_stopped: Stopped
+  service_status_notinstalled: Not Installed
+  uninstall_service: Uninstall Service
+  stop_service: Stop Service
+  uninstall_service_confirm: Are you sure you want to uninstall the service?
+  uninstall_service_success: Service uninstalled successfully, switched back to normal mode
+  stop_service_success: Service stopped successfully
+  remote_rpc_address_empty: Remote RPC Address cannot be empty
+  service_config_empty: Service Config cannot be empty
+
+client:
+  not_running: Unable to connect to remote client.
+  retry: Retry