Next-level: real critic/audience scores beyond the TMDB star. OMDb (free key,
keyed by the imdb_id we already capture) returns IMDb / RT / Metacritic.
- OMDBClient (ratings + test); built as a non-worker 'ratings_client' on the
engine. _backfill_ratings runs in both lazy detail refreshes (overwrites, since
ratings are dynamic). schema v6: imdb_rating / rt_rating / metacritic on
movies + shows; show/movie payloads return them.
- Billboard renders branded rating badges (IMDb yellow, RT tomato/splat by
fresh/rotten, Metacritic green/yellow/red by score). Lazy refresh also triggers
when an imdb_id exists but ratings are missing.
- OMDb API-key frame in Settings (parity with TMDB/TVDB) + config GET/POST +
/enrichment/omdb/test.
Seam tests: OMDb parse, engine ratings backfill, apply_ratings + payload, config
includes omdb.
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