feat(moderation): 帖评删除占位感知与硬删清场

管理删帖须填类型与理由并展示专用页；评论软删占位、版主可硬删不占楼。

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

frontend/components/NotificationBell.tsx

@@ -133,15 +133,17 @@ export default function NotificationBell({ initialUnread = 0 }: { initialUnread?
     if (n.type === "rejected") return "未通过审核";
     if (n.type === "mention") return "在消息中提到了你";
     if (n.type === "pending_review") return "有新内容待审核";
+    if (n.type === "deleted") return "删除了你的帖子";
     return "点赞了你的帖子";
   };
 
   // 审核结果类通知：无互动对象语义，使用专用图标与语义色
-  const isApproval = (n: NotificationItem) => n.type === "approved" || n.type === "rejected";
+  const isApproval = (n: NotificationItem) =>
+    n.type === "approved" || n.type === "rejected" || n.type === "deleted";
   const iconStyle = (n: NotificationItem): { color: string; bg: string; node: React.ReactNode } => {
     if (n.type === "approved")
       return { color: "var(--ok)", bg: "var(--ok-soft)", node: <CheckCircle2 size={15} /> };
-    if (n.type === "rejected")
+    if (n.type === "rejected" || n.type === "deleted")
       return { color: "var(--danger)", bg: "var(--danger-soft)", node: <XCircle size={15} /> };
     if (n.type === "like")
       return { color: "var(--clay)", bg: "var(--clay-soft)", node: <Heart size={15} /> };