fix(library): multi-genre local index with track_genre and backfill (#1059)

* fix(library): multi-genre local index with track_genre and backfill

Restore atomic genre browse, filters, and counts via track_genre:
OpenSubsonic genres[] first with Navidrome-default split fallback, sync
write path, read-path query switches, blocking startup backfill with
progress, and v12 repair migration for DBs that recorded legacy 002–011.
TS fallback adds genreTagsFor and migration gate i18n across locales.

* fix(library): address multi-genre review — robust TS genres and scope join

genreTagsFor routes raw genres through parseItemGenres (single-object
Subsonic quirk and bare strings). Library-scoped genre browse/counts join
track for raw_json library_id fallback. Statistics keeps empty-genre bucket.

* docs: CHANGELOG and credits for multi-genre local index (PR #1059)

* docs(changelog): credit HiveMind on Discord for multi-genre report (PR #1059)

src/config/settingsCredits.ts

@@ -161,6 +161,7 @@ const CONTRIBUTOR_ENTRIES = [
       'Settings → Servers: compact two-line cards, capability header badges, unified use/active action, delete in edit form, click-pinned version tooltip (PR #1054)',
       'Navidrome Now Playing and scrobble with hot cache, offline pins, and mixed-server playback reachability (PR #1055)',
       'What\'s New: remote WHATS_NEW.md from release assets, dev workspace mode, Highlights vs changelog tabs (PR #1058)',
+      'Local library index: multi-genre browse, filters, and counts via track_genre table and blocking backfill (PR #1059)',
     ],
   },
   {