Video twin of music's 'Auto-Deep Scan Library', split in two because Movies and TV
are separate libraries — scanning the TV library must not pull in new movies and
vice-versa.
- scanner: add a media_type param ('all'|'movie'|'show', friendly aliases) that
gates the movies vs shows passes (and their pruning), plus an in_progress busy
guard so the singleton scanner can't be stomped by an overlapping run.
- video_scan_library handler: thread media_type through, skip cleanly when the
scanner is busy, and name only the scanned library in the summary.
- two system automations (owned_by=video, weekly deep scan, staggered start delays):
'Auto-Deep Scan Movie Library' + 'Auto-Deep Scan TV Library'. Distinct action
types (video_deep_scan_movies / _tv) because the seeder keys on action_type; both
reuse the one handler, scoped via action_config.
- builder block gains a Library selector (Movies+TV / Movies / TV) so custom scans
can scope too; card label/icon maps cover the video action types.
Seam tests for scanner scope + busy guard, handler scope + skip, registration set.
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