feat(archsetup): set a CPU governor with cpupower

I added cpupower to the Power section: install it, set the governor in /etc/default/cpupower, and enable cpupower.service so the governor applies at boot.

The governor is performance. It's the one value valid under every cpufreq driver. amd_pstate and intel_pstate in active mode accept only performance or powersave, while passive and acpi-cpufreq also allow schedutil and ondemand. Laptops want powersave, so that's a per-host override to layer on later. The enable is non-fatal, matching the rest of the Power section.

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