feat: 新增数据看板与用户管理模块

- 数据看板：注册用户 / 图章收集 / 兑换次数 三张卡片，展示总数及本日 / 本周 / 本月新增
- 时间边界按 Asia/Shanghai 计算，周一为一周起点
- 用户管理：只读列表展示用户名、手机号、已收集、已兑换及注册时间，支持搜索
- 登录后默认跳转到数据看板，侧边栏重新编号为 7 项

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/web/src/App.tsx

@@ -7,10 +7,12 @@ import MusicPage from "./pages/MusicPage";
 import AdminLogin from "./admin/AdminLogin";
 import AdminGuard from "./admin/AdminGuard";
 import AdminLayout from "./admin/AdminLayout";
+import Dashboard from "./admin/Dashboard";
 import StampList from "./admin/StampList";
 import ArticleList from "./admin/ArticleList";
 import MusicList from "./admin/MusicList";
 import RuleList from "./admin/RuleList";
+import UsersList from "./admin/UsersList";
 import RedemptionLog from "./admin/RedemptionLog";
 
 function CollectRedirect() {
@@ -33,10 +35,12 @@ export default function App() {
         <Route path="/admin" element={<AdminLogin />} />
         <Route element={<AdminGuard />}>
           <Route element={<AdminLayout />}>
+            <Route path="/admin/dashboard" element={<Dashboard />} />
             <Route path="/admin/stamps" element={<StampList />} />
             <Route path="/admin/articles" element={<ArticleList />} />
             <Route path="/admin/music" element={<MusicList />} />
             <Route path="/admin/rules" element={<RuleList />} />
+            <Route path="/admin/users" element={<UsersList />} />
             <Route path="/admin/redemptions" element={<RedemptionLog />} />
           </Route>
         </Route>