List brand kits

curl -X GET 'https://www.unitpost.com/api/v1/brand-kits' \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'User-Agent: my-app/1.0'

{
  "object": "list",
  "data": [
    {
      "object": "brand_kit",
      "id": "id_123",
      "name": "Example",
      "is_default": false,
      "website_url": "https://example.com",
      "description": "string",
      "tone": "NEUTRAL",
      "voice_notes": "string",
      "industry": "string",
      "core_pages": [
        {
          "url": "https://example.com",
          "title": "string"
        }
      ],
      "extracted": {
        "colors": [
          {
            "hex": "string",
            "label": "string"
          }
        ],
        "logo_urls": [
          "string"
        ],
        "background_urls": [
          "string"
        ],
        "fonts": [
          "string"
        ]
      },
      "graphics": [
        {
          "library_image_id": "library_image_123",
          "role": "logo",
          "label": "string"
        }
      ],
      "source": "string",
      "updated_at": "2026-01-01T00:00:00.000Z"
    }
  ],
  "default_id": "default_123"
}