Configure proxy for API requests and remove hardcoded apiUrl from environment files.

frontend/src/main.ts

@@ -3,15 +3,12 @@ import {AppComponent} from './app/app.component';
 import {provideRouter} from '@angular/router';
 import {routes} from './app/app.routes';
 import {provideHttpClient, withInterceptors} from '@angular/common/http';
-import {BASE_PATH} from '@api';
-import {environment} from '@environment';
 import {authInterceptor} from '@services/AuthInterceptor';
 
 bootstrapApplication(AppComponent, {
   providers: [
     provideRouter(routes),
     provideHttpClient(),
-    {provide: BASE_PATH, useValue: environment.apiUrl},
     provideHttpClient(
       withInterceptors([authInterceptor])
     ),