Clone Parent Voice

Clone a parent's voice using ElevenLabs Instant Voice Cloning API.

Requirements:

• Exactly 5 audio files (mp3, wav, m4a, webm)
• Each file should be 10-15 seconds minimum for best quality
• Total duration should be 50-75 seconds (ElevenLabs recommendation)
• Longer sentences per clip improve voice naturalness

Returns: { "status": "success", "parent_voice_id": "<elevenlabs_voice_id>", "audio_stats": { "total_files": 5, "total_duration_seconds": 65.4, "individual_durations": [12.3, 14.1, 13.8, 11.9, 13.3] } }

Note: The voice_id is returned but not persisted globally. It should be saved per-story in audiobooks.parent_voice_id when creating a story.