Enables programs.hyprland at the system level, adds xdg-desktop-portal-hyprland
with per-compositor portal routing, and wires up a home-manager config for
endurance mirroring the Niri layout (same keybinds, monitors, window rules).
Niri remains the default SDDM session.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This is the result of ~100 commits to my NixOS config. Since I haven't
always used `agenix-rekey`, this is another initial commit so that none
of the secrets in my git history are leaked
