Install HyprFlux on Existing Arch

This route exists so older links keep working. The maintained procedure is the existing Arch installation guide.

The installer performs full provisioning, not a configuration-only copy. It updates Arch Linux, installs the desktop package set and services, deploys the HyprFlux configuration, and offers a reboot when it finishes.

If Arch Linux is not installed yet, choose either the HyprFlux ISO or prepare a supported base with the Arch Linux guide first.