fix: 完善自动导入异常中断与恢复

- 自动导入基础设施异常触发批次熔断，保留完整日志并输出安全错误信息

- 增加恢复令牌与租约围栏、无文档失败项重建及消息退避机制

- 前端展示中断状态并在状态请求失败后自动恢复轮询

- 补充批次中断迁移、配置与并发异常路径测试

easyflow-ui-admin/app/src/views/ai/documentCollection/DocumentImportBatchStatus.vue

@@ -3,15 +3,19 @@ import { computed, onBeforeUnmount, onMounted, ref, watch } from 'vue';
 
 import { $t } from '@easyflow/locales';
 
-import { ElButton, ElProgress } from 'element-plus';
+import { ElAlert, ElButton, ElProgress } from 'element-plus';
 
 import { api } from '#/api/request';
 
 interface BatchStatus {
   batchId: string;
+  cancelledCount?: number;
   completedCount: number;
   failedCount: number;
   importMode: 'AUTO' | 'MANUAL';
+  interruptCode?: string;
+  interruptedAt?: string;
+  interruptMessage?: string;
   pendingCount: number;
   processingCount: number;
   progressPercent: number;
@@ -43,9 +47,12 @@ const props = defineProps({
 const emit = defineEmits(['continued']);
 const batch = ref<BatchStatus>();
 const continuing = ref(false);
+const loadError = ref('');
+const refreshing = ref(false);
 let pollTimer: null | ReturnType<typeof setTimeout> = null;
 let disposed = false;
 let refreshGeneration = 0;
+let pollDelayMs = 3000;
 
 const canContinue = computed(
   () =>
@@ -55,11 +62,15 @@ const canContinue = computed(
     Number(batch.value?.failedCount || 0) > 0,
 );
 
-const processedCount = computed(
-  () =>
+const processedCount = computed(() => {
+  const processed =
     Number(batch.value?.completedCount || 0) +
-    Number(batch.value?.processingCount || 0),
-);
+    Number(batch.value?.processingCount || 0) +
+    Number(batch.value?.failedCount || 0) +
+    Number(batch.value?.skippedCount || 0) +
+    Number(batch.value?.cancelledCount || 0);
+  return Math.min(Number(batch.value?.totalCount || 0), processed);
+});
 
 const allFailed = computed(
   () =>
@@ -86,9 +97,35 @@ const statusLabel = computed(() => {
   return $t('documentCollection.importDoc.batchRunning');
 });
 
+const interruptMetadata = computed(() => {
+  if (batch.value?.status !== 'INTERRUPTED') {
+    return '';
+  }
+  const details: string[] = [];
+  if (batch.value.interruptCode) {
+    details.push(
+      `${$t('documentCollection.importDoc.interruptCode')} ${
+        batch.value.interruptCode
+      }`,
+    );
+  }
+  if (batch.value.interruptedAt) {
+    const interruptedAt = new Date(batch.value.interruptedAt);
+    details.push(
+      `${$t('documentCollection.importDoc.interruptedAt')} ${
+        Number.isNaN(interruptedAt.getTime())
+          ? batch.value.interruptedAt
+          : interruptedAt.toLocaleString()
+      }`,
+    );
+  }
+  return details.join(' · ');
+});
+
 async function refresh(hideCompletedOnRestore = false) {
   if (!props.knowledgeId) return;
   const currentGeneration = ++refreshGeneration;
+  refreshing.value = true;
   try {
     const response = await api.get('/api/v1/document/import/batch/current', {
       params: { knowledgeId: props.knowledgeId },
@@ -96,14 +133,28 @@ async function refresh(hideCompletedOnRestore = false) {
     if (disposed || currentGeneration !== refreshGeneration) {
       return;
     }
-    const restoredBatch =
-      response.errorCode === 0 ? response.data || undefined : undefined;
+    if (response.errorCode !== 0) {
+      loadError.value =
+        response.message ||
+        $t('documentCollection.importDoc.batchStatusLoadFailed');
+      return;
+    }
+    loadError.value = '';
+    pollDelayMs = 3000;
+    const restoredBatch = response.data || undefined;
     batch.value =
       hideCompletedOnRestore && restoredBatch?.status === 'COMPLETED'
         ? undefined
         : restoredBatch;
+  } catch {
+    if (!disposed && currentGeneration === refreshGeneration) {
+      loadError.value = $t(
+        'documentCollection.importDoc.batchStatusLoadFailed',
+      );
+    }
   } finally {
     if (!disposed && currentGeneration === refreshGeneration) {
+      refreshing.value = false;
       schedulePoll();
     }
   }
@@ -112,8 +163,16 @@ async function refresh(hideCompletedOnRestore = false) {
 function schedulePoll() {
   if (pollTimer) clearTimeout(pollTimer);
   pollTimer = null;
+  if (disposed) {
+    return;
+  }
+  if (loadError.value) {
+    const retryDelay = pollDelayMs;
+    pollDelayMs = Math.min(pollDelayMs * 2, 30_000);
+    pollTimer = setTimeout(refresh, retryDelay);
+    return;
+  }
   if (
-    disposed ||
     !batch.value ||
     batch.value.status === 'COMPLETED' ||
     batch.value.status === 'PARTIAL_SUCCEEDED' ||
@@ -160,6 +219,8 @@ watch(
     const knowledgeChanged = knowledgeId !== previousKnowledgeId;
     if (knowledgeChanged) {
       batch.value = undefined;
+      loadError.value = '';
+      pollDelayMs = 3000;
     }
     refresh(knowledgeChanged);
   },
@@ -230,6 +291,46 @@ watch(
     >
       {{ $t('documentCollection.importDoc.continueBatch') }}
     </ElButton>
+    <ElAlert
+      v-if="batch.status === 'INTERRUPTED'"
+      class="batch-status__alert"
+      type="error"
+      :closable="false"
+      show-icon
+      :title="
+        batch.interruptMessage ||
+        $t('documentCollection.importDoc.interruptFallback')
+      "
+      :description="interruptMetadata"
+    />
+    <div v-if="loadError" class="batch-status__load-error">
+      <ElAlert
+        class="batch-status__alert"
+        type="error"
+        :closable="false"
+        show-icon
+        :title="loadError"
+      />
+      <ElButton type="primary" link :loading="refreshing" @click="refresh()">
+        {{ $t('documentCollection.importDoc.retry') }}
+      </ElButton>
+    </div>
+  </section>
+  <section
+    v-else-if="loadError"
+    class="batch-status batch-status--error"
+    :aria-label="$t('documentCollection.importDoc.batchStatus')"
+  >
+    <ElAlert
+      class="batch-status__alert"
+      type="error"
+      :closable="false"
+      show-icon
+      :title="loadError"
+    />
+    <ElButton type="primary" link :loading="refreshing" @click="refresh()">
+      {{ $t('documentCollection.importDoc.retry') }}
+    </ElButton>
   </section>
 </template>
 
@@ -237,6 +338,7 @@ watch(
 .batch-status {
   display: flex;
   flex: 1 1 360px;
+  flex-wrap: wrap;
   gap: 12px;
   align-items: center;
   min-width: min(360px, 100%);
@@ -301,6 +403,25 @@ watch(
   min-width: 48px;
 }
 
+.batch-status__alert {
+  flex: 1 0 100%;
+}
+
+.batch-status__load-error {
+  display: flex;
+  flex: 1 0 100%;
+  gap: 8px;
+  align-items: center;
+}
+
+.batch-status__load-error .batch-status__alert {
+  flex-basis: auto;
+}
+
+.batch-status--error .batch-status__alert {
+  flex-basis: 320px;
+}
+
 @media (max-width: 900px) {
   .batch-status {
     flex-basis: 100%;