Fix: Use NEXT_PUBLIC_API_URL for all image URLs

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

@@ -103,13 +103,15 @@ const FUEL_TYPES = [
   { value: 'LPG', label: 'LPG' },
 ];
 
+const API_BASE_URL = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:8000';
+
 // 이미지 URL 변환 (로컬 경로는 백엔드 URL 추가)
 const getImageUrl = (url: string | undefined): string => {
   if (!url) return '';
   if (url.startsWith('http://') || url.startsWith('https://')) {
     return url;
   }
-  return `http://localhost:8000${url}`;
+  return `${API_BASE_URL}${url}`;
 };
 
 const YEAR_OPTIONS = Array.from({ length: 15 }, (_, i) => 2024 - i);