curl --request POST \
  --url https://geoff.ai/api/v1/music/stems \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "file_id": "file_abc123",
    "stems": ["vocals", "drums", "bass", "other"],
    "audio_setting": {
      "sample_rate": 44100,
      "format": "wav"
    }
  }'

{
  "data": {
    "task_id": "task_stems_xyz",
    "status": "processing"
  },
  "trace_id": "04ede0ab069fb1ba8be5156a24b1e081"
}

{
  "data": {
    "task_id": "task_stems_xyz",
    "status": "completed",
    "stems": {
      "vocals": {
        "url": "https://geoff.ai/api/v1/files/stem_vocals_xyz/content",
        "duration": 180000,
        "format": "wav"
      },
      "drums": {
        "url": "https://geoff.ai/api/v1/files/stem_drums_xyz/content",
        "duration": 180000,
        "format": "wav"
      },
      "bass": {
        "url": "https://geoff.ai/api/v1/files/stem_bass_xyz/content",
        "duration": 180000,
        "format": "wav"
      },
      "other": {
        "url": "https://geoff.ai/api/v1/files/stem_other_xyz/content",
        "duration": 180000,
        "format": "wav"
      }
    }
  }
}