restructure system configuration

system/modules/hardware/backlight.nix

@@ -0,0 +1,14 @@
+{
+  hardware.brillo.enable = true;
+  services.clight = {
+    enable = true;
+    settings = {
+      verbose = true;
+      backlight.disabled = true;
+      dpms.timeouts = [900 300];
+      dimmer.timeouts = [870 270];
+      gamma.long_transition = true;
+      screen.disabled = true;
+    };
+  };
+}

system/modules/hardware/bluetooth/default.nix

@@ -0,0 +1,17 @@
+{ config, lib, pkgs, ... }:
+
+{
+  hardware.bluetooth = {
+    enable = true;
+    package = pkgs.bluez5-experimental;
+  };
+  
+  environment.systemPackages = with pkgs; [
+  	galaxy-buds-client
+    live-buds-cli
+	  bluetuith
+	];
+
+   # https://github.com/NixOS/nixpkgs/issues/114222
+  systemd.user.services.telephony_client.enable = false;
+}