Add GPU driver restart functionality

[isaak654]

Is your feature request related to a problem? Please describe.
I'm frustrated when my screen flickers or the display driver hangs. Windows users usually have to press Win + Ctrl + Shift + B or restart the whole PC just to reset the graphics.

Describe the solution you'd like
CLI support: This could be exposed as a subcommand under the repair module, for example: kudu repair gpu-restart.
GUI support: A dedicated action button.

Describe alternatives you've considered
I noticed that Windows Maintenance Tools has a button for this, but since it's just a script, having it built natively into Kudu would be a great addition.

Additional context
It carries zero risk of breaking the operating system.

[Never-lab]

Triage: enhancement / Windows-only. Same gap as #395 — no repair module today.

Win+Ctrl+Shift+B is the usual user shortcut; a built-in action would need a documented, supported way to reset the display driver (not a silent key-injection hack). Zero risk to the OS is plausible for a soft GPU reset, but we should confirm the mechanism before shipping.

Tracking as: CLI kudu repair gpu-restart + optional GUI button, behind a Repair slice. Holding implementation until that surface exists or we explicitly scope a one-off command.