Convert to WAV

curl https://www.flixly.ai/api/v1/generate \
  -H "Authorization: Bearer flx_live_..." \
  -H "Content-Type: application/json" \
  -d '{
    "model": "convert-to-wav",
    "prompt": "A beautiful sunset over the ocean",
    "type": "CONVERT_TO_WAV"
  }'