Downloaded tracks landed in the generic downloads/{serverId}/{ratingKey}/
layout as video.mp3 because the path builder only special-cases movies and
episodes, so a user-visible download folder showed opaque folders and
meaningless names (#2141).
Tracks now get Music/{Artist}/{Album}/{NN - Title}.{ext} in both file and
SAF modes, grouped by sanitized album-artist with Unknown Artist/Album
fallbacks and a disc prefix on multi-disc albums. Existing downloads keep
working: playback and deletion resolve the stored path per record, and the
empty-parent cleanup keeps shared album folders while a sibling track
remains.
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