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.test.ts

@@ -153,4 +153,95 @@ describe('documentImportBatchStatus', () => {
     expect(wrapper.find('.batch-status__continue').exists()).toBe(false);
     wrapper.unmount();
   });
+
+  it('中断批次展示异常原因、错误标识和继续入口', async () => {
+    apiMocks.get.mockResolvedValue({
+      data: {
+        ...createBatch('RUNNING', 0),
+        failedCount: 2,
+        interruptCode: 'redis_unavailable',
+        interruptedAt: '2026-08-07T09:25:28+08:00',
+        interruptMessage: '缓存与消息服务异常，自动导入已中断',
+        pendingCount: 0,
+        status: 'INTERRUPTED',
+      },
+      errorCode: 0,
+    });
+
+    const wrapper = mount(DocumentImportBatchStatus, {
+      props: {
+        knowledgeId: 'knowledge-1',
+        manageable: true,
+      },
+    });
+    await flushPromises();
+
+    const alert = wrapper.find('.batch-status__alert');
+    expect(alert.exists()).toBe(true);
+    expect(alert.text()).toContain('缓存与消息服务异常，自动导入已中断');
+    expect(alert.text()).toContain('redis_unavailable');
+    expect(wrapper.find('.batch-status__count').text()).toContain('2 / 2');
+    expect(wrapper.find('.batch-status__continue').exists()).toBe(true);
+    wrapper.unmount();
+  });
+
+  it('状态接口暂时失败时展示错误并自动退避恢复轮询', async () => {
+    vi.useFakeTimers();
+    apiMocks.get
+      .mockRejectedValueOnce(new Error('network unavailable'))
+      .mockResolvedValueOnce({
+        data: createBatch('RUNNING', 1),
+        errorCode: 0,
+      });
+
+    const wrapper = mount(DocumentImportBatchStatus, {
+      props: { knowledgeId: 'knowledge-1' },
+    });
+    await flushPromises();
+
+    expect(wrapper.find('.batch-status--error').exists()).toBe(true);
+
+    await vi.advanceTimersByTimeAsync(3000);
+    await flushPromises();
+
+    expect(apiMocks.get).toHaveBeenCalledTimes(2);
+    expect(wrapper.find('.batch-status--error').exists()).toBe(false);
+    expect(wrapper.find('.batch-status').exists()).toBe(true);
+    wrapper.unmount();
+  });
+
+  it('运行批次轮询失败时保留旧状态、展示错误并自动恢复', async () => {
+    vi.useFakeTimers();
+    apiMocks.get
+      .mockResolvedValueOnce({
+        data: createBatch('RUNNING', 1),
+        errorCode: 0,
+      })
+      .mockRejectedValueOnce(new Error('network unavailable'))
+      .mockResolvedValueOnce({
+        data: createBatch('COMPLETED', 2),
+        errorCode: 0,
+      });
+
+    const wrapper = mount(DocumentImportBatchStatus, {
+      props: { knowledgeId: 'knowledge-1' },
+    });
+    await flushPromises();
+
+    await vi.advanceTimersByTimeAsync(3000);
+    await flushPromises();
+
+    expect(wrapper.find('.batch-status__summary').exists()).toBe(true);
+    expect(wrapper.find('.batch-status__load-error').exists()).toBe(true);
+
+    await vi.advanceTimersByTimeAsync(3000);
+    await flushPromises();
+
+    expect(apiMocks.get).toHaveBeenCalledTimes(3);
+    expect(wrapper.find('.batch-status__load-error').exists()).toBe(false);
+    expect(wrapper.text()).toContain(
+      'documentCollection.importDoc.batchCompleted',
+    );
+    wrapper.unmount();
+  });
 });