fix: 支付/退款链路安全加固

- 改价运费字段增加 ge=0 校验,防止负运费操控订单金额
- 退款申请增加累计退款额校验,不超过订单已付金额
- 退款申请 ext 行加 with_for_update 防并发竞态
- 退款回调增加 status!=processing 检查防重复执行
- 退款回调查询加 with_for_update 行锁防并发处理
1 job for feature/weapp in 35 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #130246
studio triggered
ci-build

00:00:35

 
Name Stage Failure
failed
ci-build Build
  output: [ null, null, null ],
pid: 77164,
stdout: null,
stderr: null
}

Node.js v22.22.0
Cleaning up project directory and file based variables
ERROR: Job failed: exit status 1