add aspects/desktop/ modules

Desktop-specific NixOS and home-manager configuration:
boot, desktop, niri, nix, services

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

aspects/desktop/boot.nix

@@ -0,0 +1,30 @@
+{ inputs, ... }:
+{
+  flake.modules.nixos.desktop-boot = { config, lib, pkgs, ... }: {
+    # Import parent aspect for inheritance
+    imports = [ inputs.self.modules.nixos.common-boot ];
+
+    boot = {
+      plymouth.enable = true;
+      initrd.systemd.enable = true;
+      loader.efi.efiSysMountPoint = "/boot/efi";
+      kernelPackages = pkgs.linuxPackages_xanmod_latest;
+      extraModprobeConfig = ''
+        options bluetooth disable_ertm=1
+      '';
+      kernel.sysctl = {
+        "net.ipv4.tcp_mtu_probing" = 1;
+      };
+      kernelParams = [
+        "quiet"
+        "splash"
+        "i2c-dev"
+        "i2c-piix4"
+        "loglevel=3"
+        "udev.log_priority=3"
+        "rd.udev.log_level=3"
+        "rd.systemd.show_status=false"
+      ];
+    };
+  };
+}