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/components/page/PageData.test.ts

@@ -59,4 +59,35 @@ describe('page data recovery', () => {
     expect(get).toHaveBeenCalledTimes(2);
     expect(wrapper.text()).not.toContain('数据加载失败，请重试');
   });
+
+  it('coalesces repeated reloads while a page request is still running', async () => {
+    let resolveInitialRequest: (value: {
+      data: { records: never[]; totalRow: number };
+    }) => void = () => {};
+    const initialRequest = new Promise<{
+      data: { records: never[]; totalRow: number };
+    }>((resolve) => {
+      resolveInitialRequest = resolve;
+    });
+    const get = vi
+      .fn()
+      .mockReturnValueOnce(initialRequest)
+      .mockResolvedValue({ data: { records: [], totalRow: 0 } });
+    const wrapper = mount(PageData, {
+      global: {
+        directives: { loading: {} },
+      },
+      props: { pageUrl: '/page', requestClient: { get } },
+    });
+
+    const firstReload = (wrapper.vm as any).reload({ silent: true });
+    const secondReload = (wrapper.vm as any).reload({ silent: true });
+
+    expect(get).toHaveBeenCalledTimes(1);
+    resolveInitialRequest({ data: { records: [], totalRow: 0 } });
+    await Promise.all([firstReload, secondReload]);
+    await flushPromises();
+
+    expect(get).toHaveBeenCalledTimes(2);
+  });
 });