fix: resolve naming conflict between Activity type and icon

frontend/react-shadcn/pc/src/pages/DashboardPage.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react'
-import { Users, Zap, Activity, Database, Loader2 } from 'lucide-react'
+import { Users, Zap, Activity as ActivityIcon, Database, Loader2 } from 'lucide-react'
 import { Card, CardHeader, CardTitle, CardContent } from '@/components/ui/Card'
 import { apiClient } from '@/services/api'
 import type { DashboardStats, Activity } from '@/types'
@@ -90,7 +90,7 @@ export function DashboardPage() {
       title: '活跃用户',
       value: stats ? formatNumber(stats.activeUsers) : '-',
       change: calculateGrowth(stats?.activeUsers || 0),
-      icon: Activity,
+      icon: ActivityIcon,
       color: 'from-green-500 to-emerald-600',
     },
     {
@@ -230,7 +230,7 @@ export function DashboardPage() {
               { label: '添加用户', icon: Users, action: 'users' },
               { label: '系统设置', icon: Zap, action: 'settings' },
               { label: '数据备份', icon: Database, action: 'backup' },
-              { label: '查看日志', icon: Activity, action: 'logs' },
+              { label: '查看日志', icon: ActivityIcon, action: 'logs' },
             ].map((item, index) => (
               <button
                 key={index}