Suno v4.5 API

# 1. Create the job. 202 Accepted; the body carries the task id,
#    the pre-charged price, and a poll_url. Reuse one Idempotency-Key
#    across retries so a timeout never starts a second paid job.
curl --fail-with-body https://api.omniakey.com/v1/media/tasks \
  -H "Authorization: Bearer $OMNIAKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: suno-v4.5-001" \
  -d '{
    "model": "suno-v4.5",
    "type": "audio",
    "operation": "generate",
    "input": {"prompt": "a paper boat on a quiet lake at sunset"},
    "parameters": {"title": "Paper Boats"}
  }'

# 2. Description mode sends input.prompt alone and lets the model write
#    the words. Custom lyrics mode adds input.lyrics plus the style:
#    {"prompt": "indie folk", "lyrics": "[Verse] ..."} —
#    parameters.style (or .tags) overrides the style, and
#    parameters.instrumental: true drops the vocal entirely.

# 3. Poll GET /v1/media/tasks/{id} until status is
#    succeeded | failed | canceled. Progress carries percent and stage.
curl --fail-with-body https://api.omniakey.com/v1/media/tasks/TASK_ID \
  -H "Authorization: Bearer $OMNIAKEY_API_KEY"

# 4. Download assets[0].url before expires_at, or poll again for a
#    fresh signed URL. Failed and canceled jobs are refunded.
curl -sS -o out.mp3 "$(jq -r '.assets[0].url' result.json)"