feat(zone): 三区标记M3——新增BotSourceTag组件(最近Bot更新时间/来源/批次,缺失隐藏)，接入/kpis/:id、/bot-kpis、/alerts三页 (three-zone P0-①)

frontend/src/views/AlertList.vue

@@ -9,6 +9,10 @@
       </div>
     </div>
 
+    <div style="margin:0 0 8px;display:flex;justify-content:flex-end;">
+      <BotSourceTag :updated-at="latestAlertTime" source="预警引擎" />
+    </div>
+
     <!-- 顶部选项卡 -->
     <div style="margin:12px 0;display:flex;gap:12px;align-items:center;">
       <el-radio-group v-model="activeTab" size="small">
@@ -342,6 +346,7 @@ import { ref, computed, onMounted } from 'vue'
 import { useRoute } from 'vue-router'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import { alertApi, userApi, actionPlanApi, kpiApi, alertRulesApi } from '../api/index'
+import BotSourceTag from '../components/BotSourceTag.vue'
 import RiskCell from '../components/charts/RiskCell.vue'
 
 const route = useRoute()
@@ -398,6 +403,13 @@ function isTrendAlert(msg: string): boolean {
   return msg?.startsWith('[趋势') || msg?.startsWith('[动态')
 }
 
+// ── C区标注：预警数据由预警引擎(定时规则)自动生成，展示最近生成时间（无预警行则不显示） ──
+const latestAlertTime = computed(() => {
+  const times = alerts.value.map((a: any) => a.created_at || '').filter(Boolean)
+  if (!times.length) return ''
+  return formatTime(times.sort((x: string, y: string) => y.localeCompare(x))[0])
+})
+
 function formatTime(t: string): string {
   if (!t) return '-'
   try { return new Date(t).toLocaleString('zh-CN', { hour12: false }) } catch { return t }