changed links to local host again

Backend/.env

 PORT=5000
+#MONGODB_URI=mongodb://localhost:27017/quiz_app
 MONGODB_URI=mongodb://127.0.0.1:27017/quiz_app
 JWT_SECRET=quiz_app_super_secret_key_2026
 JWT_EXPIRES_IN=7d

Frontend/src/app/services/auth.service.ts

@@ -20,7 +20,7 @@ export interface AuthResponse {
   providedIn: 'root'
 })
 export class AuthService {
-  private apiUrl = 'https://quiz-master-b3zl.onrender.com/api/auth';
+  private apiUrl = 'http://localhost:5000/api/auth';
   
   currentUser = signal<User | null>(null);
   isLoggedIn = signal<boolean>(false);

Frontend/src/app/services/quiz.service.ts

@@ -6,8 +6,8 @@ import { Observable } from 'rxjs';
   providedIn: 'root'
 })
 export class QuizService {
-  private adminUrl = 'https://quiz-master-b3zl.onrender.com/api/admin';
-  private studentUrl = 'https://quiz-master-b3zl.onrender.com/api/student';
+  private adminUrl = 'http://localhost:5000/api/admin';
+  private studentUrl = 'http://localhost:5000/api/student';
 
   constructor(private http: HttpClient) {}