- Add MusicBrainz to Cache Browser: stats pill, source filter, dedicated
browse endpoint, cards with matched/failed status indicators
- Add Clear MusicBrainz and Clear Failed MB Only to cache clear dropdown
- Move MusicBrainz into Cache Health "By Source" bar chart alongside
Spotify/iTunes/Deezer instead of isolated metric row
- Rename ambiguous "Failed Lookups" to "Failed MB Lookups" in summary cards
- Add browse-musicbrainz and clear-musicbrainz API endpoints
- Add musicbrainz_total/musicbrainz_failed to cache stats response
- Add Global Search Bar and MusicBrainz cache to changelogs
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