管理后台初始化，登录，团队管理，报价单管理 完成

src/components/auth/ProtectedRoute.jsx

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+import React from 'react';
+import { Navigate } from 'react-router-dom';
+import { useAuth } from '@/contexts/AuthContext';
+import { Spin } from 'antd';
+
+export const ProtectedRoute = ({ children }) => {
+  const { user, loading } = useAuth();
+
+  if (loading) {
+    return (
+      <div className="min-h-screen flex items-center justify-center">
+        <Spin size="large" />
+      </div>
+    );
+  }
+
+  if (!user) {
+    return <Navigate to="/login" replace />;
+  }
+
+  return children;
+};