{"message":"🖼️ Image Upload API with Numeric SKU","endpoints":{"upload":"POST /api/upload","getImageURL":"POST /api/image-url (NEW! - Returns only image URLs)","getImage":"GET /uploads/12345 or GET /api/image/12345","checkSKU":"GET /api/check/12345","listAll":"GET /api/images","delete":"DELETE /api/image/12345","productsBySKU":"POST /custom/products-by-sku"},"requirements":{"format":"PNG only","maxSize":"2 MB","filename":"Numeric only (e.g., 12345.png)"}}