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fix(payment): 退款重试耗尽时两个入口统一建差账工单并补扫漏建工单 - #41
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出站请求重试耗尽改由 PaymentDispatchService 在标记 ABANDONED 后直接建工单， 事件首发和定时重试两条路径行为一致，PaymentRequestRetryJob 不再自己建单。 ABANDONED 先提交、工单在独立事务里写，建单失败时请求已退出重试扫描， 会一直没人处理。PaymentRequestRetryJob 新增按重试间隔运行的补扫，找出 没有 outbound| 差账工单的 ABANDONED 请求逐条补建，依赖差账键去重保证幂等。 Signed-off-by: Emrys <219520811+Emryswu@users.noreply.github.com>
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问题
退款重试耗尽时，可能既不再重试、也不开差账工单。渠道拒绝后通过事件立即重试，但事件入口忽略了
attempt()返回的“已放弃请求”：例如前七次被渠道拒绝、第八次遇到网络异常，请求变成ABANDONED，定时扫描不再捞它，退款就没人接着处理了。同样情况走定时重试入口则会正常建单。另外，
ABANDONED状态先于工单的REQUIRES_NEW事务提交，如果建工单这一步自身失败，该请求也会永久漏单。修改
PaymentDispatchService.attempt()在耗尽时直接建差账工单，事件入口与定时入口共用同一处理逻辑。PaymentRequestRetryJob新增补扫：按重试间隔查找“ABANDONED但没有对应差账工单”的请求并补建工单，工单按 discrepancy key 去重，重复执行只会有一张。PaymentRequestRepository新增findAbandonedWithoutTicket()查询。验证
PaymentRetryExhaustionIntegrationTest：前七次渠道拒绝、第八次网络异常，事件入口与定时入口均为“尝试 8 次、工单 1 张”，重复触发不会多建单。AbandonedPaymentTicketBackstopIntegrationTest：漏建工单的ABANDONED请求被补扫建单且只建一张；订单不存在的请求不会被捞取。mvnw clean verify：241 项通过，17 项 MySQL/RabbitMQ 测试因无 Docker 跳过；新查询在 MySQL 上的表现以 CI 为准。