feat(cache): PG kv_cache ported from MP TTLCache, TMDB request and recognize caches

Migration 0042_cache adds UNLOGGED kv_cache. PgCache mirrors MP
runtime/cache.py (region, per-key TTL, TLRU maxsize eviction, @cached as
cachedCall); only the storage moves from memory to PG. TMDB request
responses (MP TMDb.request @cached) and recognize results (MP TmdbCache:
same key, {id:0} negative cache with EMPTY_RESULT_CACHE_TTL, type-conflict
checks, backfill after manual assignment) live in kv_cache, shared by all
processes. Settings cache.tmdbTtlHours / tmdbMaxSize / emptyResultTtlSec
map to META_CACHE_EXPIRE / CONF.tmdb / EMPTY_RESULT_CACHE_TTL. TMDB
details now also store posterPath / backdropPath.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/server/src/modules/search/media.ts

@@ -163,6 +163,7 @@ export class TmdbSearch {
                 year: m.year,
                 overview: m.overview ? (m.overview.length > 300 ? `${m.overview.slice(0, 300)}…` : m.overview) : null,
                 popularity: m.popularity,
+                ...(m.posterPath ? { posterPath: m.posterPath } : {}),
               })),
             )
             .then((list) => {