Sprint 9: add tenant-driven API resolution layer

src/app/services/api.service.ts

@@ -5,6 +5,7 @@ import { map, retry } from 'rxjs/operators';
 import { Category, DeliveryOption, Item, Subcategory } from '../models';
 import { normalizeDeliveryOption, normalizeOptionalNumber } from '../utils/normalization.utils';
 import { environment } from '../../environments/environment';
+import { ApiConfigService } from '../core/config/api-config.service';
 
 export interface QrCreateRequest {
   qrtype: 'QRDynamic';
@@ -68,7 +69,6 @@ export interface QrDynamicStatusResponse {
   providedIn: 'root'
 })
 export class ApiService {
-  private readonly baseUrl = environment.apiUrl;
   private readonly qrBaseUrl = (environment as any).qrApiUrl as string;
   private readonly cartPaymentPartnerId = 'web-97ec-9c57-4dde-9037-3a68f7f83750';
 
@@ -77,7 +77,14 @@ export class ApiService {
     delay: (_error: unknown, retryCount: number) => timer(Math.pow(2, retryCount) * 500)
   };
 
-  constructor(private http: HttpClient) {}
+  constructor(
+    private readonly http: HttpClient,
+    private readonly apiConfig: ApiConfigService
+  ) {}
+
+  private get baseUrl(): string {
+    return this.apiConfig.getBaseUrl();
+  }
 
   /** Map API language codes (RU/EN/AM) → frontend codes (ru/en/hy) */
   private normalizeLang(apiLang: string): string {