Display BanGUI version in dashboard and server config UI

frontend/src/types/config.ts

@@ -661,6 +661,8 @@ export interface ServiceStatusResponse {
   online: boolean;
   /** fail2ban version string, or null when offline. */
   version: string | null;
+  /** BanGUI application version (from the API). */
+  bangui_version: string;
   /** Number of currently active jails. */
   jail_count: number;
   /** Aggregated current ban count across all jails. */

frontend/src/types/server.ts

@@ -21,4 +21,6 @@ export interface ServerStatus {
 /** Response shape for ``GET /api/dashboard/status``. */
 export interface ServerStatusResponse {
   status: ServerStatus;
+  /** BanGUI application version (from the API). */
+  bangui_version: string;
 }