refactor(auth): replace UserService with AuthService usage

frontend/src/app/feature/game/slots/slots.component.ts

@@ -13,6 +13,7 @@ import { FormsModule } from '@angular/forms';
 import { UserService } from '@service/user.service';
 import { Subscription } from 'rxjs';
 import { AnimatedNumberComponent } from '@blackjack/components/animated-number/animated-number.component';
+import { AuthService } from '@service/auth.service';
 
 interface SlotResult {
   status: 'win' | 'lose' | 'blank' | 'start';
@@ -39,6 +40,7 @@ interface SlotResult {
 export default class SlotsComponent implements OnInit, OnDestroy {
   private httpClient: HttpClient = inject(HttpClient);
   private userService = inject(UserService);
+  private authService = inject(AuthService);
   private userSubscription: Subscription | undefined;
 
   slotInfo = signal<Record<string, number> | null>(null);
@@ -61,7 +63,7 @@ export default class SlotsComponent implements OnInit, OnDestroy {
       this.slotInfo.set(data);
     });
 
-    this.userSubscription = this.userService.getCurrentUser().subscribe((user) => {
+    this.userSubscription = this.authService.userSubject.subscribe((user) => {
       this.balance.set(user?.balance ?? 0);
     });