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-starter/easyflow-starter-all/src/main/resources/application.yml

@@ -128,6 +128,9 @@ easyflow:
       consumer-batch-size: 200
       consumer-block-timeout: 2000ms
       pending-claim-idle: 60000ms
+      consumer-failure-initial-backoff: 1s
+      consumer-failure-max-backoff: 30s
+      consumer-failure-log-interval: 60s
       max-retry: 16
       consumer-executor:
         core-size: 16