curl --request POST \
  --url 'https://api.elkapi.com/kling/v1/videos/text2video' \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "model": "kling-v3",
  "prompt": "日差しのある庭を走る小さな子猫、映画的、高精細",
  "image": "https://example.com/image.png",
  "duration": 5,
  "response_format": "json",
  "metadata": {}
}'

{
  "task_id": "task_1234567890",
  "status": "queued"
}