fix: image upload returns correct data structure for all editors

src/app/api/admin/images/route.ts

@@ -53,7 +53,7 @@ export async function POST(request: NextRequest) {
       [filename, data, category || 'other', room_id || null, location_target || 'gallery']
     );
 
-    return NextResponse.json({ image: rows[0] });
+    return NextResponse.json({ data: rows[0] });
   } catch (error) {
     if ((error as Error).message === 'Unauthorized') {
       return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });