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/CommentSection.tsx

@@ -1,4 +1,4 @@
-"use client";
+"use client";
 
 import { useEffect, useRef, useState } from "react";
 import { useRouter } from "next/navigation";
@@ -29,6 +29,8 @@ import { useAllowComments, useCommentsRequireLogin } from "@/components/Comments
 import CommentsUnsupported from "@/components/CommentsUnsupported";
 import CommentsLoginRequired from "@/components/CommentsLoginRequired";
 import Avatar from "./Avatar";
+import LevelBadge from "./LevelBadge";
+import BadgeChip from "./BadgeChip";
 import Pagination from "./Pagination";
 import MarkdownBodyClient from "@/components/MarkdownBodyClient";
 import MarkdownEditor from "@/components/MarkdownEditor";
@@ -994,6 +996,11 @@ export default function CommentSection({
                   ) : (
                     <span className="cmt-name">{authorName}</span>
                   )}
+                  {author && <LevelBadge level={author.level} />}
+                  {author &&
+                    (author.badges ?? []).slice(0, 2).map((ub) => (
+                      <BadgeChip key={ub.id} badge={ub.badge} />
+                    ))}
                   {isOp && <span className="cmt-badge">楼主</span>}
                   {c.status === "pending" && <span className="badge-pending shrink-0">待审</span>}
                   {acceptedCommentId === c.id && <span className="badge-accepted shrink-0">已采纳</span>}
@@ -1090,6 +1097,11 @@ export default function CommentSection({
                 ) : (
                   <span className="cmt-name">{authorName}</span>
                 )}
+                {author && <LevelBadge level={author.level} />}
+                {author &&
+                  (author.badges ?? []).slice(0, 2).map((ub) => (
+                    <BadgeChip key={ub.id} badge={ub.badge} />
+                  ))}
                 {isOp && <span className="cmt-badge">楼主</span>}
                 {c.status === "pending" && <span className="badge-pending shrink-0">待审</span>}
                 {acceptedCommentId === c.id && <span className="badge-accepted shrink-0">已采纳</span>}