Add OutOfHours field to AdminReserveSlotRequest. When true, skip the closing hours check allowing admin to reserve slots outside normal business hours. Add tests for call-in, walk-in, without-flag failure, and time blocker interaction. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>