feat: /api/leaderboard?format=export 语料回流导出通道（治理规则 2 前置） - #1
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- 默认榜单视图不变（payload 明文永不出服务端）
- export 视图：payload 明文 + attackSurface 映射（消费方无需读 levels/）+ limit 上限 500
- flag 形状令牌在源头确定性打码（FLAG{REDACTED}）——回流管道的脱敏步骤前移，导出文件不可携带真 flag
- 测试 2 条：导出内容与默认视图隔离、空库与 limit 裁剪；99/99 全绿
- export 视图单次可达 500 行 payload 明文，原实现无限流；现按 IP 限流，429 附 retry-after，超限响应不带 payload 数据 - 默认榜单视图不受影响；审计日志记录 rate-limited 事件（route=leaderboard-export） - 测试 +1：第 6 次导出 429、默认视图不受限流影响；100/100 全绿
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按方案 v2 §九「并行前置工作」与 §5.2 治理规则 2，为语料飞轮「攻 → 审」管道补一条公开导出接口：
GET /api/leaderboard?format=export返回injectarena-export@1格式：破阵 payload 明文 +attackSurface映射（消费方无需读levels/）+ 段位榜，limit上限 500FLAG{…}→FLAG{REDACTED}）——回流管道的「脱敏（flag 替换）」步骤前移到导出处，导出文件不可能携带真 flag；人工闸保留data/audit.db测试
export-corpus子命令）消费方与回流闭环
回流脚本（M4）将调用
?format=export→ 人工闸 → prompt-corpus-zh 入库（source: "arena"+verifiedAt，见 RFC-0001）