Run ltx-2.3 (reframe)

Submit a reframe job to ltx-2.3. The request carries the real fields of this model; there is no hidden switch on a model parameter. Send `quote_only: true` to price the request for free, then send the same body with the returned `quote_id` to run it. Attach identity, product, or a first frame by resource id (`avatar_id`, `product_id`, `scene_id`) or by a workspace-owned `cdn.roasos.com` URL. Any other URL is `400 reference_media_not_workspace_owned`. Pass a `webhook_url` and roasOS POSTs you the same job envelope `GET /v1/jobs/{id}` returns when the job finishes, signed with `X-RoasOS-Signature` and retried on failure. The URL must be HTTPS and reachable (`400 invalid_url` otherwise), and first-party keys cannot register webhooks (`400 webhook_url_not_supported_for_key`). See **Webhooks** above for verification. Polling `links.status` works too.

curl -X POST "https://example.com/v1/reframe/ltx-2.3" \  -H "Idempotency-Key: stringstringstri" \  -H "Content-Type: application/json" \  -d '{    "video_url": "http://example.com",    "aspect_ratio": "1:1",    "resolution": "720p"  }'

{  "data": {    "kind": "quote",    "quote_id": "3c071a1d-db86-46a7-9dc8-72ba3fbca992",    "credits": 0,    "expires_at": "string",    "pricing_version": "string",    "confirmation": {      "property1": null,      "property2": null    }  }}