Fix Korean text in banner drag-and-drop section

- Translate car name to English using translateCarName
- Remove Korean year suffix (년)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/app/admin/cars/page.tsx

@@ -1336,9 +1336,9 @@ export default function CarsAdminPage() {
                           )}
                         </div>
                         <div className="flex-1 min-w-0">
-                          <div className="font-medium text-gray-800 truncate">{car.car_name}</div>
+                          <div className="font-medium text-gray-800 truncate">{translateCarName(car.car_name || '', 'en')}</div>
                           <div className="text-xs text-gray-500">
-                            {car.year}년 | {car.mileage?.toLocaleString()}km
+                            {car.year} | {car.mileage?.toLocaleString()}km
                           </div>
                         </div>
                         <button