gahusb 096e291ed8 feat(music-lab): 다중 트랙 컴파일 백엔드 (FFmpeg concat+crossfade → MP4) ...

- db.py: compile_jobs 테이블 추가 + CRUD 5종 (create/get/list/update/delete)
- compiler.py: acrossfade 필터 체인 + 그라디언트 배경 + MP4 렌더링 워커
- main.py: /api/music/compile POST·GET·DELETE + /api/music/compiles GET + /api/music/compile/{id}/export GET

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-01 16:54:53 +09:00

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