curl --request POST \
  --url https://api.siray.ai/v1/images/generations/async \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "aspect_ratio": "1:1",
  "model": "google/nano-banana-2-t2i",
  "prompt": "example_value",
  "size": "512"
}
'

{
  "code": "success",
  "data": {
    "task_id": "<string>"
  },
  "message": "<string>"
}