feat: add power management service

modules/nixos/desktop/power.nix

@@ -0,0 +1,17 @@
+{ ... }:
+{
+  # TuneD - Tuning Profile Delivery Mechanism for Linux
+  # A modern replacement for PPD(power-profiles-daemon)
+  services.tuned = {
+    enable = true;
+    settings.dynamic_tuning = true;
+    ppdSupport = true; # translation of power-profiles-daemon API calls to TuneD
+    ppdSettings.main.default = "balanced"; # balanced / performance / power-saver
+  };
+  # DBus service that provides power management support to applications
+  # Required by `tuned-ppd` for handling power supply changes
+  services.upower.enable = true;
+
+  services.power-profiles-daemon.enable = false; # conflicts with tuned
+  services.tlp.enable = false; # conflicts with tuned
+}