kdletters
077b139e80
修复 SpacetimeDB 连接池请求取消后槽位泄漏导致池耗尽
- spacetime-client：PooledConnectionLease 增加 Drop 兜底，请求 future 被取消时也复位槽位并归还连接与 permit
- spacetime-client：槽位改为 AtomicBool 占用标记 + Mutex 连接存放，acquire 改为 CAS 抢占，删除可能永久空转的扫描循环
- spacetime-client：release_connection 与取消路径统一走租约 Drop 归还逻辑
- spacetime-client：新增 dropped_lease_releases_slot_and_permit 等单元测试复现并锁定该故障机制
- docs：新增 SpacetimeDB 连接池租约 Drop 兜底与取消安全文档记录根因、复现与验收
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