feat(web): MP-style media detail with seasons and episodes, shared by library and TMDB preview (MD-1)

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

apps/web/app/components/media/external-links.ts

@@ -0,0 +1,23 @@
+// 外部身份 → 外站链接(媒体详情头部):TMDB / IMDb / TVDB / Wikidata。只拼公开地址,不带任何凭证。
+
+export function externalLinks(ids: {
+  tmdb?: { type: "movie" | "tv"; id: string } | null;
+  imdb?: string | null;
+  tvdb?: string | null;
+  wikidata?: string | null;
+  tvdbKind?: "movie" | "series";
+}): { label: string; href: string }[] {
+  const out: { label: string; href: string }[] = [];
+  if (ids.tmdb && /^\d+$/.test(ids.tmdb.id))
+    out.push({ label: "TMDB", href: `https://www.themoviedb.org/${ids.tmdb.type}/${ids.tmdb.id}` });
+  if (ids.imdb && /^tt\d+$/.test(ids.imdb))
+    out.push({ label: "IMDb", href: `https://www.imdb.com/title/${ids.imdb}/` });
+  if (ids.tvdb && /^\d+$/.test(ids.tvdb))
+    out.push({
+      label: "TVDB",
+      href: `https://thetvdb.com/dereferrer/${ids.tvdbKind ?? (ids.tmdb?.type === "movie" ? "movie" : "series")}/${ids.tvdb}`,
+    });
+  if (ids.wikidata && /^Q\d+$/.test(ids.wikidata))
+    out.push({ label: "Wikidata", href: `https://www.wikidata.org/wiki/${ids.wikidata}` });
+  return out;
+}