fix: 修复 total_consumption undefined 和 SelectItem 空字符串错误

frontend/src/pages/admin/agent-apps/index.vue

@@ -22,11 +22,11 @@ const inactiveCount = computed(() => agentApps.value.filter(app => app.status ==
 const totalBalance = computed(() => agentApps.value.reduce((sum, app) => sum + (app.balance || 0), 0))
 
 const searchFilter = ref('')
-const statusFilter = ref('')
+const statusFilter = ref('all')
 
 const filteredApps = computed(() => {
   let result = agentApps.value
-  if (statusFilter.value) {
+  if (statusFilter.value && statusFilter.value !== 'all') {
     result = result.filter(app => app.status === statusFilter.value)
   }
   if (searchFilter.value) {
@@ -179,7 +179,7 @@ onMounted(() => {
                 <UiSelectValue placeholder="全部状态" />
               </UiSelectTrigger>
               <UiSelectContent>
-                <UiSelectItem value="">
+                <UiSelectItem value="all">
                   全部状态
                 </UiSelectItem>
                 <UiSelectItem value="active">

frontend/src/pages/admin/agents/components/columns.ts

@@ -102,7 +102,7 @@ export function getColumns(actions: {
       header: () => t('admin.agents.columns.totalConsumption'),
       cell: ({ row }) => {
         const consumption = row.getValue('total_consumption') as number
-        return `¥${consumption.toFixed(2)}`
+        return `¥${(consumption || 0).toFixed(2)}`
       },
     },
     {