curl --request POST \
  --url https://api.propops.app/api/users/appearance \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form uuid=3c90c3cc-0d44-4b50-8888-8dd25736052a \
  --form csrf_token=abc123def456 \
  --form banner_file='@example-file' \
  --form clear_banner=false \
  --form 'dashboard_bg_custom=linear-gradient(135deg, #667eea 0%, #764ba2 100%)'

{
  "success": true,
  "message": "Operation completed successfully"
}