Replace category-based tag settings (10 toggles) with per-tag controls
grouped by source service in an accordion UI. Each of the 11 service
groups (Spotify, iTunes, MusicBrainz, Deezer, AudioDB, Tidal, Qobuz,
Last.fm, Genius, General) has a master toggle that disables all child
tags, with individual toggles for fine-grained control. ISRC and
copyright fallback chains are now per-source toggleable. Genre merge
contributions from each source are independently controllable. All
tags default to enabled for backward compatibility.
b9732156cd