Storage was already per-server (movies/shows UNIQUE(server_source, server_id),
episodes via per-server show_id, prune_missing scoped) — but reads returned
every server's rows, so a Jellyfin scan would show up alongside Plex.
Mirror the music standard: scope reads to the active video server
(resolve_video_server). query_library, calendar_upcoming, dashboard_stats and
library_id_for_tmdb take a server_source; the dashboard/library/calendar
endpoints pass it. server_source=None keeps "all servers" (enrichment processes
every server; tests unchanged). No schema change, no data migration — existing
Plex data is untouched and simply hidden while Jellyfin is the active server.
Regression tests: same title on both servers stays two rows; scoped reads only
return the active server's data; deep-scan prune never touches the other server.
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