feat(web): 作品页与订阅选季的剧集组轨道和季卡片

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

apps/web/app/components/episode-mapping/mapping-panel.tsx

@@ -65,7 +65,10 @@ function SeasonSummary({ p }: { p: EpisodeMappingPreview["seasons"] }) {
           {s.season === p.latestSeason ? " · 最新" : ""}
         </Chip>
       ))}
-      <span className="text-meta text-muted-foreground">{p.ended ? "已完结" : "未完结"}</span>
+      <span className="text-meta text-muted-foreground">
+        {p.ended ? "已完结" : "未完结"}
+        {p.structure ? ` · 按剧集组「${p.structure.name}」分季` : ""}
+      </span>
     </div>
   );
 }