The deep scan stores tmdb_id/tvdb_id/imdb_id from Plex/Jellyfin, but the workers
only ever searched by title+year and ignored those ids — re-deriving matches the
server already had exact (wasteful, and a title search can mis-match).
enrichment_next now surfaces the row's known provider id; the worker forwards it
and the TMDB/TVDB clients fetch details BY ID (one call, no /search) when it's
present, falling back to title/year search only for items the server couldn't
identify. Still grabs the overview/backdrop the scan doesn't capture.
Every scan (incremental / full / deep, both entry points) now steps the
enrichment workers aside to cut DB lock contention — same as music. Mirrors
music's contract exactly: pause ONLY workers that were running (a user's manual
pause is left alone), track which we paused, and resume just those in a finally
so success, cancel, and error all clean up. Auto-pause is transient
(persist=False) so it never leaks into the saved <service>_paused flag.
Hooks are injected by get_video_scanner; the scanner is inert without them
(tests build it directly, no engine spun up). Isolated to the video side.
Pause/resume now write <service>_paused to video_settings, and the engine
restores each worker's saved pause when it's (re)built — mirrors music's
<service>_enrichment_paused boot flag. Isolated to video.db; music untouched.
