A deep scan is the equivalent of music's full refresh — it READS the server's
current state into video.db and prunes what's gone. It should NOT tell Plex to
rescan its disk. The deep-scan action types were wired to auto_video_scan_library
(nudge Plex + read); point them at the read-only auto_video_update_database in
'deep' mode instead. Update-db phase wording no longer says "new" for a full re-read;
deep-scan block descriptions clarify it's a read, not a disk-scan. Registration test
asserts the deep scans route to the read-only handler and never nudge the server.
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