Background music playlist

Place all Ogg or MP3 files in this directory, including any subdirectories. The build scans every .ogg and .mp3 file, sorts the filenames, and exposes them as the site's background-music playlist.

For example, docs/public/music/01-intro.ogg is published at /music/01-intro.ogg. After adding or removing tracks, restart the local development server or run a new production build so the playlist is regenerated.