feat: 足迹 Footprints 个人留痕系统

桌面应用(Tauri+React+SQLite)：时间线/记录/学年学科成绩梯度/统计/类型与字段模板/附件内容寻址/详情视图/PWA

同步服务端(sync-server)：多用户+邀请码/LWW推拉/seq游标/附件去重/Docker部署

多端同步地基：uuid v7/HLC混合逻辑时钟/软删除墓碑/sync_oplog，Node与Rust双端一致并通过自动化测试

app/src/App.tsx

@@ -0,0 +1,32 @@
+import { lazy, Suspense } from 'react';
+import { Navigate, Route, Routes } from 'react-router-dom';
+import { AppShell } from '@/components/layout/AppShell';
+import { TimelinePage } from '@/pages/timeline/TimelinePage';
+
+// 非首屏页面懒加载：echarts 等重依赖仅在进入对应路由时拉取
+const RecordsPage = lazy(() => import('@/pages/records/RecordsPage').then(m => ({ default: m.RecordsPage })));
+const DashboardPage = lazy(() => import('@/pages/dashboard/DashboardPage').then(m => ({ default: m.DashboardPage })));
+const GradesPage = lazy(() => import('@/pages/grades/GradesPage').then(m => ({ default: m.GradesPage })));
+const TypesPage = lazy(() => import('@/pages/types/TypesPage').then(m => ({ default: m.TypesPage })));
+const TaxonomyPage = lazy(() => import('@/pages/taxonomy/TaxonomyPage').then(m => ({ default: m.TaxonomyPage })));
+
+function PageLoading() {
+  return <div className="py-16 text-center text-[13px] text-ink-3">加载中…</div>;
+}
+
+export default function App() {
+  return (
+    <Routes>
+      <Route element={<AppShell />}>
+        <Route path="/" element={<Navigate to="/timeline" replace />} />
+        <Route path="/timeline" element={<TimelinePage />} />
+        <Route path="/records" element={<Suspense fallback={<PageLoading />}><RecordsPage /></Suspense>} />
+        <Route path="/grades" element={<Suspense fallback={<PageLoading />}><GradesPage /></Suspense>} />
+        <Route path="/dashboard" element={<Suspense fallback={<PageLoading />}><DashboardPage /></Suspense>} />
+        <Route path="/types" element={<Suspense fallback={<PageLoading />}><TypesPage /></Suspense>} />
+        <Route path="/taxonomy" element={<Suspense fallback={<PageLoading />}><TaxonomyPage /></Suspense>} />
+        <Route path="*" element={<Navigate to="/timeline" replace />} />
+      </Route>
+    </Routes>
+  );
+}