Set up environment-based configurations for API and builds.

Replaced hardcoded API URLs with environment-specific configurations. Added new environments (development, beta, production) with respective settings. Updated build scripts and Angular file replacements to support environment-based builds.

frontend/src/main.ts

@@ -4,13 +4,13 @@ import {provideRouter} from '@angular/router';
 import {routes} from './app/app.routes';
 import {provideHttpClient} from '@angular/common/http';
 import {BASE_PATH} from './api';
-
+import {environment} from './environments/environment';
 
 bootstrapApplication(AppComponent, {
   providers: [
     provideRouter(routes),
     provideHttpClient(),
-    {provide: BASE_PATH, useValue: 'http://localhost:8080'}
+    {provide: BASE_PATH, useValue: environment.apiUrl}
   ]
 }).catch(err => console.error(err));