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Adds the libretro thumbnail repository as a first-class artwork source so region-correct box art (PAL/Europe, Japan, etc.) can be matched directly to ROM filenames, addressing rommapp/romm#3239. Implementation follows the SGDB handler pattern (artwork-only, no game metadata): MetadataSource enum entry, scan-time fetch wired into the SCAN_ARTWORK_PRIORITY loop, /search/roms integration, MatchRom dialog chip + cover selection, and a heartbeat flag. Matching is exact case-insensitive against the directory listing first (so a ROM named "(Europe)" lands on the (Europe) artwork), with a JaroWinkler fuzzy fallback at 0.8 that strips parenthetical tags from both sides. Listings are cached in Redis with a 24h TTL. `libretro_id` is persisted on the Rom model as the SHA1 hex of the matched libretro filename — stable across scans, distinct per region, indexed for lookup. Migration 0077 adds the column. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>