Code review found: f"{task_id}_v2" / "_inst" synthetic task IDs never
exist in NAS music_tasks table -> webhook returns 404 -> silent fail.
NAS music-lab/main.py._sync_library_with_disk() auto-registers any
.mp3 in the disk that has no DB row on next GET /api/music/library.
So Windows worker just writes the file to SMB; NAS picks it up on
the next library fetch -- matches NAS source behavior at file level.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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