Remove app.config.ts, integrate configuration directly in main.ts, and refactor providers to include authInterceptor.

frontend/src/app/app.config.ts

@@ -1,18 +0,0 @@
-import {ApplicationConfig, provideZoneChangeDetection} from '@angular/core';
-import {provideRouter} from '@angular/router';
-import {CookieService} from 'ngx-cookie-service';
-
-import {routes} from './app.routes';
-import {provideHttpClient, withInterceptors} from '@angular/common/http';
-import {authInterceptor} from '@services/AuthInterceptor';
-
-export const appConfig: ApplicationConfig = {
-  providers: [
-    provideZoneChangeDetection({eventCoalescing: true}),
-    provideRouter(routes),
-    CookieService,
-    provideHttpClient(
-      withInterceptors([authInterceptor])
-    ),
-  ]
-};