fix: 防止重复报名 - 个人项目和集体项目都添加重复检查

- 个人项目:检测到重复报名时返回错误而非更新
- 集体项目:添加重复报名检查
- 新增 /martial/athlete/registered API 用于查询已报名选手

Closes #3
This commit is contained in:
2026-01-15 15:56:29 +08:00
parent c6bf0d3404
commit b9d1d2987e
10 changed files with 39 additions and 7 deletions
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