curl --request POST \
  --url http://localhost:8000/api/v1/client/img-upscale \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form image='@example-file' \
  --form model=RealESRGAN_x4 \
  --form 'webhook_url=<string>'

{
  "data": {
    "request_id": "550e8400-e29b-41d4-a716-446655440000"
  }
}