feat(ui): hide GPU service menu from navigation

Add hideInMenu: true to gpuService route to temporarily hide the
entire GPU service section (instances, templates, storage, public keys).

config/routes.ts

@@ -175,6 +175,7 @@ const baseRoutes = [
     name: 'gpuService',
     path: '/gpu-service',
     key: 'gpuService',
+    hideInMenu: true,
     routes: [
       {
         path: '/gpu-service',