feat: newapi-dashboard 全栈项目初始化

为 new-api (LLM API 网关) 构建独立前端管理面板:
- React 18 + TypeScript + Vite + Ant Design 5 前端
- Node.js + Express + better-sqlite3 BFF 后端
- 登录页: 站点选择器 + UserID + AccessToken 认证
- 仪表盘: 用户信息、额度环形图、7天趋势图、模型饼图、令牌概览、日志时间线
- 账单页: 筛选日志表格、模型消耗柱状图、充值记录、CSV/PDF 导出(HMAC签名)
- 管理员站点管理: 站点 CRUD
- API 代理: 多站点切换，会话管理

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

src/App.tsx

@@ -0,0 +1,70 @@
+import { useEffect } from 'react'
+import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom'
+import { ConfigProvider, App as AntApp, Spin } from 'antd'
+import zhCN from 'antd/locale/zh_CN'
+import { lightTheme } from '@/utils/theme'
+import { useAuthStore } from '@/store/authStore'
+import { authApi } from '@/api/auth'
+import Layout from '@/components/Layout'
+import Login from '@/pages/Login'
+import Dashboard from '@/pages/Dashboard'
+import Billing from '@/pages/Billing'
+import SiteManagement from '@/pages/admin/SiteManagement'
+
+function ProtectedRoute({ children }: { children: React.ReactNode }) {
+  const { isLoggedIn, loading } = useAuthStore()
+
+  if (loading) {
+    return (
+      <div style={{ display: 'flex', justifyContent: 'center', alignItems: 'center', height: '100vh' }}>
+        <Spin size="large" tip="Loading..." />
+      </div>
+    )
+  }
+
+  return isLoggedIn ? <>{children}</> : <Navigate to="/login" />
+}
+
+function SessionRestore({ children }: { children: React.ReactNode }) {
+  const { sessionToken, login, logout, setLoading } = useAuthStore()
+
+  useEffect(() => {
+    if (sessionToken) {
+      authApi.me()
+        .then((res) => {
+          if (res.data.success) {
+            login(sessionToken, res.data.data.userInfo, res.data.data.site)
+          } else {
+            logout()
+          }
+        })
+        .catch(() => logout())
+    } else {
+      setLoading(false)
+    }
+  }, [])
+
+  return <>{children}</>
+}
+
+export default function App() {
+  return (
+    <ConfigProvider locale={zhCN} theme={lightTheme}>
+      <AntApp>
+        <BrowserRouter>
+          <SessionRestore>
+            <Routes>
+              <Route path="/login" element={<Login />} />
+              <Route path="/" element={<ProtectedRoute><Layout /></ProtectedRoute>}>
+                <Route index element={<Navigate to="/dashboard" />} />
+                <Route path="dashboard" element={<Dashboard />} />
+                <Route path="billing" element={<Billing />} />
+                <Route path="admin/sites" element={<SiteManagement />} />
+              </Route>
+            </Routes>
+          </SessionRestore>
+        </BrowserRouter>
+      </AntApp>
+    </ConfigProvider>
+  )
+}