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/BotKpiDashboard.vue

@@ -7,6 +7,7 @@
         <el-tag type="warning" size="small" effect="plain">2026年7月</el-tag>
       </div>
       <div class="header-right">
+        <BotSourceTag :updated-at="latestBotUpdate?.time || ''" :source="latestBotUpdate?.source || ''" :batch="latestBotUpdate?.batch || ''" style="margin-right:10px;" />
         <el-button size="small" @click="refresh" :loading="loading">刷新</el-button>
       </div>
     </div>
@@ -163,6 +164,7 @@
 <script setup lang="ts">
 import { ref, computed, onMounted } from 'vue'
 import { botKpiApi } from '../api/index'
+import BotSourceTag from '../components/BotSourceTag.vue'
 import { DataBoard, WarningFilled, User } from '@element-plus/icons-vue'
 
 const loading = ref(false)
@@ -193,6 +195,18 @@ const alertsInfo = computed(() => {
   return cnt > 0 ? `🚨 ${cnt} 个KPI需要关注` : '✅ 一切正常'
 })
 
+// ── C区标注：Bot KPI看板数据最近一次更新（取各KPI最新值回填时间中的最大值，无则不显示） ──
+const latestBotUpdate = computed(() => {
+  const rows = kpis.value.filter((k: any) => k.value_updated_at)
+  if (!rows.length) return null
+  const row = rows.slice().sort((a: any, b: any) => String(b.value_updated_at).localeCompare(String(a.value_updated_at)))[0]
+  return {
+    time: row.value_updated_at || '',
+    source: row.value_source_batch || 'finance-bot',
+    batch: row.value_source_batch || '',
+  }
+})
+
 function formatVal(val: any, unit: string) {
   if (val == null) return '-'
   if (unit === '%') return val + '%'