feat: 添加三个 service 文件和 RoleGuard 组件

frontend/src/components/AuthGuard/RoleGuard.jsx

@@ -0,0 +1,20 @@
+/**
+ * 角色路由守卫 — 拦截非授权角色访问受保护路由
+ * 用法: <Route path="/users" element={<RoleGuard roles={['zhipianren']}><UserManage /></RoleGuard>} />
+ */
+import { Navigate } from 'react-router-dom'
+import useAuthStore from '../../stores/authStore'
+
+function RoleGuard({ children, roles }) {
+  const { user } = useAuthStore()
+
+  if (!user) return null // AuthGuard 已处理未登录跳转
+
+  if (!roles.includes(user.role)) {
+    return <Navigate to="/dashboard" replace />
+  }
+
+  return children
+}
+
+export default RoleGuard