feat(sites): on-demand site detail page content (INT-2)

- SiteReleaseDetail.page: description, MediaInfo/BDInfo, screenshots,
  IMDb / Douban / TMDB ids, file list, tags, uploader, plus a parse probe
  (labels found) for layout-change diagnosis. Generic NexusPHP rules
  (field label -> next sibling) starting from the MovieClaw detail
  selectors; site overrides under umt.detail.page (HHClub: div labels).
  M-Team builds the same structure from descr BBCode + mediainfo.
- Fetched only on demand (drawer open without cache, "复核详情",
  release.inspect); content in kv_cache region site.detail for the
  site detail cache period (>= 24 h); within the window the site is not
  requested again. External ids persist in source_release.raw._detail,
  which list snapshots do not overwrite.
- Screenshots only as proxy paths /api/v1/img/site-detail/{rid}/{i}:
  public-address check on every hop, no site credentials, magic-byte
  image check, 8 MB cap. Poster proxy shares the same helper.
- Identity: site ids count as explicit-id evidence; when TMDB is
  queried, a TMDB id goes straight to details and an IMDb id to
  /find (no title search on a hit). Douban only for local recall.
- Release drawer "站点详情页" section; fixtures and tests for HHClub div
  layout, rowhead layout, BBCode, cache/proxy/identity end to end.

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

packages/adapters/src/tmdb/client.ts

@@ -348,6 +348,16 @@ export class TmdbClient {
     return [...m, ...t].sort((a, b) => (b.popularity ?? 0) - (a.popularity ?? 0));
   }
 
+  /** /find/{imdb_id}?external_source=imdb_id:IMDb ID → 电影 / 剧集候选(站点详情页给出的 IMDb 链接走这里) */
+  async findByImdb(imdbId: string): Promise<MetadataCandidate[]> {
+    if (!/^tt\d{5,10}$/.test(imdbId)) return [];
+    const lang = this.langs[0]!;
+    const p = await this.get<Json>(`/find/${imdbId}`, { external_source: "imdb_id", language: lang });
+    const movies = (Array.isArray(p.movie_results) ? p.movie_results : []) as Json[];
+    const tvs = (Array.isArray(p.tv_results) ? p.tv_results : []) as Json[];
+    return [...movies.map((r) => this.fromBrief("movie", r, lang)), ...tvs.map((r) => this.fromBrief("tv", r, lang))];
+  }
+
   /** 详情:多语言标题、别名(alternative_titles)、外部 ID、季列表(剧集)。不存在抛 notfound。 */
   async details(type: MediaEntityType, id: string | number): Promise<MetadataCandidate> {
     const [first, ...rest] = await Promise.all(