E5 S5: enriched Plex detail page (ratings + facts + keywords + crew)

Consumes the TMDB block the S2 engine already persists + serves (movie/show
detail's `tmdb`), turning the movie info page into a Seerr-style enriched detail
(page variant only — the player overlay stays lean):

- Multi-source ratings row: IMDb (links out) · TMDb (with vote count) · Plex
  audience — whichever are present. Only the primary score (IMDb, else audience)
  carries the ratingMin filter, mirroring the backend rating column.
- Facts panel: release · runtime · cert · budget · revenue · studios · countries.
- Keyword chips → tap to filter the library. Backend: a new `keywords` filter on
  LibraryFilters + meta_filter_conds (`keywords @> [kw]`, both models), wired
  through PlexFilters (appendPlexFilters / plexFilterCount / active-chip / clear).
- Full crew (TMDB key-crew) → tap a name to open their person page.

Tests: test_plex_keyword_filter.py (3) + PlexInfo.dom.test.tsx (5, incl. the
overlay-stays-lean guard). New i18n plex.info.facts.* / keywords / crew / audience
(en+hu). Gate: vitest 337, backend lane 396.

backend/app/plex/query.py

@@ -140,6 +140,8 @@ def meta_filter_conds(model, p: dict, lang: str = "en") -> list:
     stds = split_csv(p.get("studios"))
     if stds:  # OR
         conds.append(model.studio.in_(stds))
+    for kw in split_csv(p.get("keywords")):  # AND — TMDB keyword chips from the detail page (E5 S5)
+        conds.append(model.keywords.contains([kw]))
     if p.get("collection"):
         conds.append(model.collection_keys.contains([p["collection"]]))
     return conds
@@ -171,6 +173,7 @@ class LibraryFilters:
         "any"  # how multiple actors combine: any (OR, default) | all (AND)
     )
     studios: str | None = None
+    keywords: str | None = None  # TMDB keyword chips (E5 S5), CSV; language-neutral
     collection: str | None = None
 
     def as_dict(self) -> dict:
@@ -188,6 +191,7 @@ class LibraryFilters:
             "actors": self.actors,
             "actor_mode": self.actor_mode,
             "studios": self.studios,
+            "keywords": self.keywords,
             "collection": self.collection,
         }