feat: SongSelect panel — NAS song list with download/play in Menu.unity

- Add DownloadManager, SongLibrary, SongSelectManager, SongDetailPanel scripts
- Rebuild SongSelect panel inside Menu.unity using VRBeatsKit style:
  left scroll list (ALL/OWNED tabs) + right detail panel (diff buttons, Download/Delete/Play)
- SceneBuilder replaced: only ③ Menu — Rebuild SongSelect Panel remains
- All UI text in English

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
2026-05-22 01:22:16 +09:00
parent 4dad9e5d5b
commit 58c88dafff
11 changed files with 5857 additions and 559 deletions
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