feat: 用户徽章与等级体系，积分经济管理重构

- 新增徽章系统：badge 服务与 handler、管理端配置页、BadgeChip/LevelBadge 展示组件
- 新增等级模型：model/level 及前端 levels 元数据
- 管理端经济模块拆分为 points/badges/levels 独立页面，EconomySettings 迁入设置
- 积分、签到、评论等服务适配等级与徽章逻辑

frontend/components/NotificationBell.tsx

@@ -3,7 +3,7 @@
 import { useState, useEffect, useRef } from "react";
 import { useRouter } from "next/navigation";
 import Link from "next/link";
-import { Bell, CheckCheck, Heart, MessageCircle, CheckCircle2, XCircle, AtSign, ClipboardList } from "lucide-react";
+import { Bell, CheckCheck, Heart, MessageCircle, CheckCircle2, XCircle, AtSign, ClipboardList, Award } from "lucide-react";
 import {
   apiFetchNotifications,
   apiUnreadCount,
@@ -99,11 +99,13 @@ export default function NotificationBell({ initialUnread = 0 }: { initialUnread?
       );
     }
     setOpen(false);
-    // @提及通知跳到群聊房间；其余跳到帖子/评论
+    // @提及通知跳到群聊房间；徽章通知无关联帖子（仅标已读）；其余跳到帖子/评论
     if (n.type === "mention" && n.room_id) {
       router.push(`/chat/${n.room_id}`);
     } else if (n.type === "pending_review") {
       router.push(n.post_id ? `/post/${n.post_id}` : "/admin/content?status=pending");
+    } else if (n.type === "badge") {
+      return;
     } else {
       router.push(`/post/${n.post_id}`);
     }
@@ -134,6 +136,7 @@ export default function NotificationBell({ initialUnread = 0 }: { initialUnread?
     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";
+    if (n.type === "badge") return "向你颁布了徽章";
     return "点赞了你的帖子";
   };
 
@@ -151,6 +154,8 @@ export default function NotificationBell({ initialUnread = 0 }: { initialUnread?
       return { color: "var(--accent)", bg: "var(--accent-soft)", node: <AtSign size={15} /> };
     if (n.type === "pending_review")
       return { color: "var(--accent)", bg: "var(--accent-soft)", node: <ClipboardList size={15} /> };
+    if (n.type === "badge")
+      return { color: "var(--gold)", bg: "var(--gold-soft)", node: <Award size={15} /> };
     return { color: "var(--accent)", bg: "var(--accent-soft)", node: <MessageCircle size={15} /> };
   };