feat(tmdb): opt-in TMDB metadata enrichment for Xtream and Stalker portals

Adds an opt-in TMDB integration (Settings > Metadata) that enriches
detail views with a field-level merge — the provider stays authoritative
for stream data, TMDB fills editorial fields when the match is confident.

Enrichment:
- Movie/series details: plot, cast (avatar chips), director, genres,
  rating, poster/backdrop, official YouTube trailers
- Confidence-gated matching: provider tmdb_id trusted; otherwise
  normalized-title search with year gate (±1; series accept earlier
  premieres), season-suffix stripping, Cyrillic search-language override,
  and language-prefix fallback variants
- Lazy season/episode enrichment: real episode names, overviews, stills
- "Similar" rail (Xtream): TMDB recommendations matched to the catalog
- Actor pages per portal with full filmography, availability filter and
  an Electron-only "All portals" scope backed by a batched DB_MATCH_TITLES
  worker op over the trigram FTS index

Infrastructure:
- SQLite cache table tmdb_metadata (details, search verdicts, seasons,
  persons; per-language, TTL-guarded), in-memory fallback for the PWA
- Settings: enable toggle, own-API-key override with a live "check key"
  button; TMDB attribution in Settings and About
- Embedded key stays an empty placeholder; CI injects TMDB_API_KEY via
  tools/tmdb/inject-tmdb-key.mjs when the secret is configured
- normalizeTitle shared between renderer and DB worker
- CSP: allow YouTube embeds (frame-src was 'none'; trailers never worked)

Fixes and refactors along the way:
- fix(stalker): Advanced Search sent bare get_ordered_list requests and
  skipped the auth handshake when isFullStalkerPortal was missing on the
  active-playlist meta — full portals answered "Authorization failed."
  and search looked empty; now mirrors the catalog request shape and
  routes through makeAuthenticatedRequest with URL-based detection
- fix(stalker): TMDB fields survive info re-normalization; detail views
  prefer the store copy patched by async enrichment over stale snapshots
- refactor(xtream): split oversized vod/serial detail components into
  component-scoped playback services; detail routes re-initialize on
  route param changes (router reuses them for detail-to-detail nav)
- i18n: all new keys translated across the 18 locales

Docs: docs/architecture/tmdb-metadata-enrichment.md + CLAUDE.md updates.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/workflows/build-and-make.yaml

@@ -100,6 +100,13 @@ jobs:
             - name: Install dependencies
               run: pnpm install --frozen-lockfile
 
+            - name: Inject TMDB API key
+              # No-op when the secret is unavailable (e.g. fork PRs) — the
+              # app then requires a user-provided key for TMDB enrichment.
+              env:
+                  TMDB_API_KEY: ${{ secrets.TMDB_API_KEY }}
+              run: node tools/tmdb/inject-tmdb-key.mjs
+
             - name: Build frontend
               run: pnpm nx build web --skip-nx-cache