curl -X POST "https://api.scanova.io/qr-assets/design-template/" \
  -H "Authorization: 401f7ac837da42b97f613d789819ff93537bee6a" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Blue Gradient",
    "resource_type": "qr_category",
    "category": 3,
    "design_info": { "bg": "#0033ff" },
    "gradient_type": "linear",
    "is_template": true
  }'

{
  "id": 9,
  "name": "Blue Gradient",
  "resource_type": "qr_category",
  "category": 3,
  "design_info": { "bg": "#0033ff" },
  "gradient_type": "linear",
  "color_palette": null,
  "font_styles": null,
  "is_template": true,
  "info": null,
  "template_id": null
}