feat: add BGM playback control for big screen display

- Add audio player to display store with play/stop functions
- Listen for music state changes from AdminState sync
- Support bgm, lottery, and fanfare audio tracks
- Create audio directory structure

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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2026-01-25 22:05:30 +08:00
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# Audio Files Directory
Place the following audio files here:
- bgm.mp3 - Background music (will loop)
- lottery.mp3 - Lottery spinning music (will loop)
- fanfare.mp3 - Winner celebration sound effect