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/PostRow.tsx

@@ -6,6 +6,7 @@ import { getPublicSettingsCached } from "@/lib/serverData";
 import { normalizePostType, postTypeLabel, typeStatusLabel, typeStatusClass } from "@/lib/postMeta";
 import LikeButton from "./LikeButton";
 import Avatar from "./Avatar";
+import BadgeChip from "./BadgeChip";
 import { IconComment, IconEye } from "./Icons";
 
 /**
@@ -103,6 +104,9 @@ export default async function PostRow({
           >
             {authorName}
           </Link>
+          {(post.user.badges ?? []).slice(0, 2).map((ub) => (
+            <BadgeChip key={ub.id} badge={ub.badge} />
+          ))}
           <span aria-hidden>·</span>
           <span className="tabular-nums">{formatRelative(post.created_at)}</span>
           {replied && (