Feature request: Allow scheduling automatic shutdown or sleep after a specified number of minutes

### Description of the new feature / enhancement

右键关机/睡眠可以设定多少分钟后自动关机/睡眠等。

**English translation:** Add a right-click shutdown/sleep option that lets users specify how many minutes to wait before automatically shutting down or putting the computer to sleep.

### Scenario when this would be used?

挂机一定时间后关机

**English translation:** Shut down the computer after it has been left running unattended for a specified period.

### Supporting information

_No response_

No files, tests, or entry points are named. Start by locating the PowerToys area responsible for shutdown or sleep actions and review how its right-click options are implemented; define the user flow for entering minutes and verify that both delayed shutdown and delayed sleep work after the specified interval.

Written by the indexing model from the issue text.