feat: add PlayOnTrigger for music-synced audio playback

- Add PlayOnTrigger method to AudioSystem for scheduling audio playback on music sync events (beat/bar/grid)
- Rename ButtonInvoker to SetStateBind for better clarity
- Update PlaySoundBind to support both direct playback and trigger-based playback with callback flags
- Add CallbackFlags enum (MusicSyncBeat, MusicSyncBar, MusicSyncGrid)
- Update Metronome demo to use new callback flag naming convention
- Add test audio file sfx_notice_test.wav
- Update scene UI to demonstrate PlayOnTrigger functionality

Assets/Resources/Audios/sfx_notice_test.wav.meta

@@ -0,0 +1,23 @@
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