curl -X PATCH https://api.lavendly.ai/v1/workflows/wf_xyz/clips/vid1/audio \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer $LAVENDLY_API_KEY' \
  -d '{ "native_audio": { "mode": "mix", "volume": 0.6 } }'

{
  "clip_id": "vid1",
  "native_audio": { "mode": "mix", "volume": 0.6 },
  "updated_at": 1734001234567
}