修复权限验证问题：普通用户无法访问后台管理页面

demo/frontend/src/components/DailyActiveUsersChart.vue

@@ -86,17 +86,17 @@ const loadChartData = async () => {
     ])
     
     // 处理图表数据
-    if (chartRes.data && chartRes.data.monthlyData) {
+    if (chartRes && chartRes.monthlyData) {
       await nextTick()
-      initChart(chartRes.data.monthlyData)
+      initChart(chartRes.monthlyData)
     }
     
     // 处理概览数据
-    if (overviewRes.data) {
-      todayDAU.value = overviewRes.data.todayDAU || 0
-      dayGrowthRate.value = overviewRes.data.dayGrowthRate || 0
-      monthlyAvgDAU.value = overviewRes.data.monthlyAvgDAU || 0
-      monthGrowthRate.value = overviewRes.data.monthGrowthRate || 0
+    if (overviewRes) {
+      todayDAU.value = overviewRes.todayDAU || 0
+      dayGrowthRate.value = overviewRes.dayGrowthRate || 0
+      monthlyAvgDAU.value = overviewRes.monthlyAvgDAU || 0
+      monthGrowthRate.value = overviewRes.monthGrowthRate || 0
     }
     
   } catch (error) {

demo/frontend/src/components/Footer.vue

@@ -85,3 +85,5 @@
 
 
 
+
+

demo/frontend/src/components/NavBar.vue

@@ -137,7 +137,12 @@ const handleUserCommand = async (command) => {
       ElMessage.info('个人资料功能开发中')
       break
     case 'admin':
-      router.push('/admin/dashboard')
+      // 检查管理员权限
+      if (userStore.isAdmin) {
+        router.push('/admin/dashboard')
+      } else {
+        ElMessage.warning('权限不足，只有管理员才能访问后台管理')
+      }
       break
     case 'settings':
       ElMessage.info('设置功能开发中')