Enrichment now harvests the full detail payload (same call, no extra requests):
- TMDB: tagline, genres, rating (vote_average), runtime, status, first/last air
date (shows), release date + runtime (movies) — on top of overview/backdrop/ids.
- TVDB: switches to /series/<id>/extended for overview + genres.
enrichment_apply now uses BACKFILL semantics: metadata columns are written via
COALESCE(NULLIF(col,''), ?) so enrichment only fills fields the media server
left empty — it never clobbers server-provided data. Genres backfill to the
normalised link tables only when the item has none yet. Whitelist expanded for
the new columns.
Seam tests: backfill-only (server overview/genres kept, gaps filled), genre
backfill when empty, TMDB full-metadata extraction.
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