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/KPIDetail.vue

@@ -146,7 +146,8 @@
 
         <el-tab-pane label="历史数据" name="history">
           <div style="display:flex;justify-content:flex-end;margin-bottom:8px;">
-            <el-button size="small" type="primary" plain @click="openAddValueDialog">➕ 录入数据</el-button>
+            <BotSourceTag :updated-at="latestBotValue?.updated_at || ''" :source="latestBotSource" />
+            <el-button size="small" type="primary" plain @click="openAddValueDialog" style="margin-left:10px;">➕ 录入数据</el-button>
           </div>
           <v-chart :option="chartOption" autoresize class="full-width-chart" />
           <el-table :data="values" size="small" class="data-table">
@@ -359,10 +360,20 @@ import { kpiApi, mapApi, kpiCausalityApi, orgApi, userApi } from '../api/index'
 import api from '../api/index'
 import { useFormGuard } from '../composables/useFormGuard'
 
+import BotSourceTag from '../components/BotSourceTag.vue'
+
 const route = useRoute()
 const kpi = ref<any>(null)
 const values = ref<any[]>([])
 
+// ── C区标注：该KPI最近一次Bot回填（source_type=bot 的最新值；无则不显示） ──
+const latestBotValue = computed(() => {
+  const botVals = values.value.filter((v: any) => v.source_type === 'bot' && (v.updated_at || v.source_batch))
+  if (!botVals.length) return null
+  return botVals.slice().sort((a: any, b: any) => String(b.updated_at || '').localeCompare(String(a.updated_at || '')))[0]
+})
+const latestBotSource = computed(() => latestBotValue.value?.source_batch || '')
+
 // ── 人工录入数据 ──
 const showAddValue = ref(false)
 const addValueSaving = ref(false)