Update Help & Docs with missing features and new additions
New sections: Download History (source provenance, AcoustID badges),
Global Search, Deezer ARL Playlists, Deezer Link (split), Database
Maintenance (VACUUM/incremental), Artist Map (3 modes), Listening
Stats, Smart Delete (3 options), Track Redownload (3-step wizard),
Library Issues, Playlist Explorer.
Updated sections: Overview (Discogs, Emby), Connecting Services
table (Discogs row, Emby), Deezer Playlists (rewritten for ARL),
Service Credentials (Discogs token), Library Standard View (source
filter dropdown), Service Matching (10 services, Enrich dropdown),
Repair & Maintenance (expanded to all 16 jobs with table, Witness
Me safety dialog).
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