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/app/admin/points/page.tsx

@@ -0,0 +1,44 @@
+import type { Metadata } from "next";
+import { cookies } from "next/headers";
+import { fetchAdminEconomyStats, type EconomyStats, type PublicSettings } from "@/lib/api";
+import { authCookieHeader } from "@/lib/cookies";
+import { getMeCached, getPublicSettingsCached } from "@/lib/serverData";
+import { isAdminOrAbove, isSuperOrOwner } from "@/lib/roles";
+import Forbidden from "../Forbidden";
+import PointsTabs from "./PointsTabs";
+
+export const metadata: Metadata = {
+  title: "积分管理",
+};
+
+export default async function AdminPointsPage() {
+  const cookie = authCookieHeader(await cookies());
+  const me = await getMeCached(cookie || undefined);
+  if (!me.user || !isAdminOrAbove(me.user.role)) {
+    return <Forbidden text="积分管理仅管理员及以上可查看。" />;
+  }
+
+  const canManage = isSuperOrOwner(me.user.role);
+
+  // 经济总览预取（管理员及以上可读）；失败降级为空态，不阻塞规则/用户积分标签
+  let stats: Awaited<ReturnType<typeof fetchAdminEconomyStats>> | null = null;
+  try {
+    stats = await fetchAdminEconomyStats(cookie);
+  } catch {
+    stats = null;
+  }
+
+  // 积分规则初始值（公开设置缓存，超管/站长的规则标签用）
+  let settings: PublicSettings | null = null;
+  if (canManage) {
+    settings = await getPublicSettingsCached();
+  }
+
+  return (
+    <PointsTabs
+      stats={stats}
+      settings={settings}
+      canManage={canManage}
+    />
+  );
+}