feat: add boot nixos module

modules/nixos/boot/default.nix

@@ -0,0 +1,48 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  inherit (lib) mkDefault mkEnableOption mkIf;
+
+  cfg = config.ataraxia.defaults.boot;
+in
+{
+  options.ataraxia.defaults.boot = {
+    enable = mkEnableOption "Default boot settings";
+  };
+
+  config = mkIf cfg.enable {
+    boot = {
+      loader = {
+        timeout = mkDefault 4;
+        systemd-boot.enable = mkDefault false;
+      };
+
+      kernelParams = [
+        "kvm.ignore_msrs=1"
+        "kvm.report_ignored_msrs=0"
+        "nofb"
+        "rd.systemd.show_status=auto"
+        "rd.udev.log_priority=3"
+        "zswap.enabled=0"
+      ];
+
+      kernelPackages = pkgs.linuxPackages_xanmod_latest;
+
+      consoleLogLevel = 3;
+
+      kernel.sysctl = mkIf config.zramSwap.enable {
+        "vm.swappiness" = 100;
+        # "vm.vfs_cache_pressure" = 500;
+        # "vm.dirty_background_ratio" = 1;
+        # "vm.dirty_ratio" = 50;
+        # "vm.page-cluster" = 0;
+      };
+
+      tmp.cleanOnBoot = !config.boot.tmp.useTmpfs;
+    };
+  };
+}

modules/nixos/roles/default.nix

@@ -33,6 +33,7 @@ in
   config =
     let
       baseRole = {
+        ataraxia.defaults.boot.enable = mkDefault true;
         ataraxia.defaults.hardware.enable = mkDefault true;
         ataraxia.defaults.locale.enable = mkDefault true;
         ataraxia.defaults.lix.enable = mkDefault true;