Chore: Updated resolvers from Class to ResolveFn

overlord/src/app/settings/maintenance.resolver.ts

@@ -0,0 +1,8 @@
+import { inject } from '@angular/core';
+import { ResolveFn } from '@angular/router';
+
+import { SettingsService } from './settings.service';
+
+export const maintenanceResolver: ResolveFn<{ enabled: boolean; user: string }> = () => {
+  return inject(SettingsService).getMaintenance();
+};