TheAudioDB (theaudiodb.com) added as source #1, between fanart.tv
and Wikimedia. Uses free public API key (2) with MBID-based lookup
so matching is guaranteed — no name-based search ambiguity.
Fetches up to 4 images per artist: thumb (portrait), fanart1-3
(wider shots). Results cached 30 days in explore_cache.
Source priority order is now:
0. fanart.tv artistthumb
1. TheAudioDB thumb + fanart
2. MusicBrainz direct image rels (Wikimedia Commons)
3. Wikidata P18 (Wikimedia Commons)
4. Wikipedia lead image
yonlu
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