fix: update logout navigation to use navigateByUrl for cleaner routing

src/app/auth/auth.service.ts

@@ -111,7 +111,7 @@ export class AuthService {
     this.http.post<void>(this.api('/api/v1/auth/logout'), {}).subscribe();
     this.accessToken = null;
     this.safeRemoveToken();
-    this.router.navigate(['/admin/login']);
+    this.router.navigateByUrl('login');
   }
 
   refreshToken(): Observable<RefreshTokenResponse> {