List available brand identities

curl --request GET \
  --url https://api.usenotra.com/v1/brand-identities \
  --header 'Authorization: Bearer <token>'

{
  "organization": {
    "id": "<string>",
    "slug": "<string>",
    "name": "<string>",
    "logo": "<string>"
  },
  "brandIdentities": [
    {
      "id": "<string>",
      "name": "<string>",
      "isDefault": true,
      "websiteUrl": "<string>",
      "companyName": "<string>",
      "companyDescription": "<string>",
      "toneProfile": "<string>",
      "customTone": "<string>",
      "customInstructions": "<string>",
      "audience": "<string>",
      "language": "<string>",
      "createdAt": "<string>",
      "updatedAt": "<string>"
    }
  ]
}