Fixes a correctness bug and adds bulk re-queuing.
- Bug: per-row 'Retry' used clear-match, which sets an item to not_found
with last_attempted=NULL. The worker only retries not_found items where
last_attempted < (now - 30d), and 'NULL < cutoff' is false in SQLite, so
those items were never re-queued. Fixed by resetting match_status to NULL
(pending), which every worker's queue picks up on the next pass.
- New POST /api/enrichment/<id>/retry with scope 'item' | 'failed'
(failed = re-queue every not_found item of an entity type), backed by a
pure whitelisted build_reset_query + MusicDatabase.reset_enrichment().
- UI: per-row Retry now hits /retry; a 'Retry all failed' bulk button appears
when the current entity has not-found items (confirm + count toast); a hint
line explains retry/match/auto-retry behaviour.
- 11 new tests (38 enrichment tests total, all green).
fc9a9f1c90