cleanup: remove tenant variant logic and enforce config-driven UI

src/app/services/language.service.ts

@@ -1,6 +1,5 @@
 import { Injectable, signal } from '@angular/core';
 import { Router } from '@angular/router';
-import { environment } from '../../environments/environment';
 
 export interface Language {
   code: string;
@@ -20,8 +19,7 @@ export interface Currency {
   providedIn: 'root'
 })
 export class LanguageService {
-  // @ts-ignore
-  private currentLanguageSignal = signal<string>(environment.defaultLanguage || 'ru');
+  private currentLanguageSignal = signal<string>('ru');
   private currentCurrencySignal = signal<string>('RUB');
 
   languages: Language[] = [