fix: 工作台审查修复 - 短 TTL proxy token/沙箱剥离/加载提示/独立刷新/键盘导航/懒加载分包

frontend/src/admin/main.jsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useState } from 'react';
+import React, { lazy, Suspense, useEffect, useState } from 'react';
 import { createRoot } from 'react-dom/client';
 import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
 import { ThemeProvider } from '@mui/material/styles';
@@ -25,7 +25,8 @@ import Announcements from './pages/Announcements.jsx';
 import Links from './pages/Links.jsx';
 import Uploads from './pages/Uploads.jsx';
 import ImportDb from './pages/ImportDb.jsx';
-import Workbench from '../tools/workbench/Workbench.jsx';
+// 工作台独立分包：仅访问 /admin/workbench 时才加载（vite 自动 code-split）
+const Workbench = lazy(() => import('../tools/workbench/Workbench.jsx'));
 
 // 生产：/admin/* 由后端 fallback 到 dist/admin.html（Phase 6 需求），basename=/admin；
 // 开发：vite 多入口直接访问 /admin.html，basename 自适应为空。
@@ -77,8 +78,21 @@ function AdminApp() {
       <CssBaseline />
       <BrowserRouter basename={basename}>
         <Routes>
-          {/* 工作台：独立全屏布局，不套 AdminLayout（自带 Toolbar+Sidebar+内容区） */}
-          <Route path="/workbench" element={<Workbench />} />
+          {/* 工作台：独立全屏布局，不套 AdminLayout（自带 Toolbar+Sidebar+内容区）；懒加载分包 */}
+          <Route
+            path="/workbench"
+            element={
+              <Suspense
+                fallback={
+                  <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'center', height: '100vh' }}>
+                    <CircularProgress />
+                  </Box>
+                }
+              >
+                <Workbench />
+              </Suspense>
+            }
+          />
           <Route element={<AdminLayout />}>
             <Route index element={<Navigate to="/dashboard" replace />} />
             <Route path="/dashboard" element={<Dashboard />} />