feat(posts): 类型特殊块移至正文下，采纳答案卡与中奖楼层按评论标记

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/components/AcceptedAnswerReopen.tsx

@@ -0,0 +1,36 @@
+"use client";
+
+import { useState } from "react";
+import { useRouter } from "next/navigation";
+import { apiReopenQuestion } from "@/lib/api";
+import { toast } from "@/lib/toast";
+
+/** 已采纳答案卡上的「重新打开」——并入正文下方资料卡，避免与上方状态条重复 */
+export default function AcceptedAnswerReopen({ postId }: { postId: number }) {
+  const router = useRouter();
+  const [busy, setBusy] = useState(false);
+
+  const reopen = async () => {
+    setBusy(true);
+    try {
+      const res = await apiReopenQuestion(String(postId));
+      if (res.post) {
+        toast("已重新打开", "ok");
+        router.refresh();
+      } else toast(res.error || "操作失败", "error");
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <button
+      type="button"
+      className="btn btn-line btn-sm shrink-0 ml-auto"
+      disabled={busy}
+      onClick={() => void reopen()}
+    >
+      {busy ? "处理中…" : "重新打开"}
+    </button>
+  );
+}