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/test/acquisition-organize/library-versions.test.ts

@@ -336,4 +336,32 @@ describe.skipIf(!hasPg)("LIBV-1 入库版本", () => {
     expect(response.body.data.downloads).toHaveLength(105);
     expect(response.body.data.droppedPlans).toHaveLength(51);
   });
+
+  it("作品详情头部标语只给简体中文(displayTagline);存储的 metadata.tagline 不变", async () => {
+    const field = (value: unknown, language: string | null = null) => ({
+      value,
+      source: "tmdb",
+      language,
+      at: "2026-10-01T00:00:00.000Z",
+      locked: false,
+    });
+    const cases: [string, string, string | null][] = [
+      ["我们注定要离开地球", "en", "我们注定要离开地球"],
+      ["我們註定要離開地球", "en", null],
+      ["Mankind was born on Earth.", "en", null],
+      ["我們註定要離開地球", "zh", "我們註定要離開地球"],
+    ];
+    for (const [tagline, orig, want] of cases) {
+      const entityId = await seedEntity(h.db, { kind: "movie", title: `标语 ${tagline}`, year: 2026 });
+      await h.db
+        .updateTable("media_entity")
+        .set({ metadata: JSON.stringify({ tagline: field(tagline), originalLanguage: field(orig) }) })
+        .where("id", "=", entityId)
+        .execute();
+      const r = await h.api("GET", `/library/${entityId}`);
+      expect(r.status).toBe(200);
+      expect(r.body.data.displayTagline).toBe(want);
+      expect(r.body.data.entity.metadata.tagline.value).toBe(tagline);
+    }
+  });
 });