管理后台初始化，登录，团队管理，报价单管理 完成

src/components/Layout/MainLayout.jsx

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+import React, { useState, Suspense } from 'react';
+import { Layout, Spin } from 'antd';
+import { Outlet } from 'react-router-dom';
+import Header from './Header';
+import Sidebar from './Sidebar';
+import { useTheme } from '@/contexts/ThemeContext';
+
+const { Content } = Layout;
+
+const MainLayout = () => {
+  const [collapsed, setCollapsed] = useState(false);
+  const { isDarkMode } = useTheme();
+
+  return (
+    <Layout style={{ minHeight: '100vh' }}>
+      <Sidebar collapsed={collapsed} />
+      <Layout>
+        <Header collapsed={collapsed} setCollapsed={setCollapsed} />
+        <Content
+          style={{
+            margin: '24px 16px',
+            padding: 24,
+            background: isDarkMode ? '#141414' : '#fff',
+            borderRadius: '4px',
+          }}
+        >
+          <Suspense fallback={<Spin size="large" />}>
+            <Outlet />
+          </Suspense>
+        </Content>
+      </Layout>
+    </Layout>
+  );
+};
+
+export default MainLayout;