video enrichment 1b: worker engine + TMDB/TVDB clients
Isolated enrichment subsystem mirroring the music worker pattern, on video.db.
- VideoEnrichmentWorker: daemon loop pulling enrichment_next -> client.match ->
enrichment_apply; pause/resume/stop; get_stats in the same shape the music
enrichment API returns (enabled/running/paused/idle/current_item/stats/
progress/breakdown). Client injected -> loop fully unit-tested with a fake.
- TMDB/TVDB clients (thin adapters, keys from video_settings): .enabled +
match(kind,title,year) -> {id, metadata}; validated live, worker logic tested.
- VideoEnrichmentEngine registry + lazy get_video_enrichment_engine() singleton.
8 tests (match/not_found/error-resilience/stats/disabled/engine/isolation).
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