代码量最大的微服务（1149 行），承载核心业务：群众提交政务申请、附件上传、申请查询与撤回。包含分布式锁、MQ 事务一致性、ClamAV 病毒扫描等多重安全保障。 submit(dto) 进入 │ ├─ 第0层：Redisson 分布式锁（幂等防重） │ key = "gov:idempotent:submit:{userId} ...

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