curl --request DELETE \
  --url https://quizquail.com/api/v1/themes/{id} \
  --header 'Authorization: Bearer <token>'

{
  "type": "https://quizquail.com/problems/validation-error",
  "title": "Validation Error",
  "status": 400,
  "detail": "Request validation failed",
  "instance": "<string>",
  "errors": [
    {
      "field": "title",
      "message": "Title is required",
      "code": "too_small"
    }
  ]
}