fix(media): 详情页标语只显示简体中文,简中没有时不显示

- adapters 新增 simplifiedChineseTagline:取值语言为繁中 / 非中文、或文字是繁体特有字时不显示;原语言为中文(zh / cn)的作品按简中处理
- TMDB 富详情带回 taglineLanguage;发现页详情的 tagline 按上述口径给出
- 媒体库作品详情新增 displayTagline(存储的标语语言为 null,只能按文字判断);metadata.tagline 存储不变
- 补 adapters 单测与作品详情接口测试

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

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

@@ -3,6 +3,7 @@ import {
   fetchRichDetail,
   fetchRichSeason,
   type MetadataCandidate,
+  simplifiedChineseTagline,
   TmdbError,
   type TmdbRichDetail,
 } from "@umt/adapters";
@@ -453,7 +454,7 @@ export function registerSearchRoutes(app: ModuleApp, ctx: ServerContext, d: Sear
       out.title = rich.title || out.title;
       out.overview = rich.overview ?? out.overview;
       out.titleZh = rich.titleZh;
-      out.tagline = rich.tagline;
+      out.tagline = simplifiedChineseTagline(rich.tagline, rich.taglineLanguage, rich.originalLanguage);
       out.genres = rich.genres;
       out.voteAverage = rich.voteAverage;
       out.voteCount = rich.voteCount;