refactor(dashboard): 去掉仪表盘30秒自动刷新逻辑

frontend/src/views/dashboard/DashboardPage.vue

@@ -244,7 +244,7 @@ const recentAlerts = ref<RecentAlert[]>([])
 const startLoading = ref(false)
 const stopLoading = ref(false)
 const refreshLoading = ref(false)
-let refreshTimer: number | undefined
+
 
 // ECharts refs
 const trendChartRef = ref<HTMLElement>()
@@ -393,11 +393,9 @@ async function loadData() {
 
 onMounted(() => {
   loadData()
-  refreshTimer = window.setInterval(loadData, 30000) as unknown as number
 })
 
 onUnmounted(() => {
-  if (typeof refreshTimer === 'number') clearInterval(refreshTimer)
   disposeCharts()
 })
 </script>