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/chat/[id]/ChatRoomClient.tsx

@@ -49,6 +49,8 @@ import { canOverseeChat, isOwner as isSiteOwner } from "@/lib/roles";
 import { toast } from "@/lib/toast";
 import { scrollBehavior } from "@/lib/motion";
 import Avatar from "@/components/Avatar";
+import LevelBadge from "@/components/LevelBadge";
+import BadgeChip from "@/components/BadgeChip";
 import AutolinkText from "@/components/AutolinkText";
 import ConfirmDialog from "@/components/ConfirmDialog";
 import ContextMenu, { type CtxMenuItem } from "@/components/ContextMenu";
@@ -1420,6 +1422,14 @@ export default function ChatRoomClient({
                               >
                                 {m.sender.nickname}
                               </span>
+                              {!isDirect && (
+                                <>
+                                  <LevelBadge level={m.sender.level} />
+                                  {(m.sender.badges ?? []).slice(0, 1).map((ub) => (
+                                    <BadgeChip key={ub.id} badge={ub.badge} />
+                                  ))}
+                                </>
+                              )}
                               <span className="meta text-[10.5px]">
                                 {formatTime(m.created_at)}
                               </span>