该接口供访客轮询自己刚提交评论的审核状态，故不加 admin 鉴权（会破坏合法 轮询）；改为加 strict 限流（对 unknown IP 降级宽松桶），阻止批量枚举评论 状态（L3）。复用 check_strict_limit，与其它敏感接口一致。
Accepts Vec<i64> of comment IDs, returns their current status. IDs not found in DB return status 'gone'. Empty vec returns early. Used by client to prune localStorage pending comments that are no longer pending (approved/spam/trash/deleted).
