feat(排行榜): 页头显示当前在线人数,在线绿点只给老师
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新增匿名可读的 GET /api/site/online,一条 ZCOUNT 让 Redis 自己数,
不拉成员、也不写(清理过期成员留给后台列表,匿名接口不带写操作)。
榜单页进页面拉一次,为 0 时不显示。

/rankings/users 的 isOnline 是三态:null 表示「这个调用方不该知道」,
只有老师及以上拿到 true/false。写成普通 boolean 的话学生看到的 false
和真的离线分不开,等于默认把每个人的在线状态摊给全校同学看。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017xu912Rv5JUUuy6MqMcQW2
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xuyueandClaude Opus 5 committed 2026-09-07 19:36:12 -06:00
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@@ -396,7 +396,7 @@ export type ContestRank = Omit<
submissionInfo: { [key: string]: SubmissionInfo }
}
export type { WebsiteConfig } from "@oj2/contract"
export type { WebsiteConfig, OnlineCount } from "@oj2/contract"
export type {
JudgeServer as Server,