Add utm-aarch64 host configuration

hosts/utm-aarch64/default.nix

@@ -0,0 +1,58 @@
+{ config, lib, pkgs, disko, sops-nix, ... }:
+
+{
+  imports = [
+    disko.nixosModules.disko
+  ];
+
+  # ============================================
+  # Machine-Specific Configuration
+  # ============================================
+
+  networking.hostName = "mac-nix";
+  networking.domain = "";
+
+  # Disko: Auto-partitioning configuration
+  disko.devices = {
+    disk.main = {
+      type = "disk";
+      device = "/dev/vda";
+      content = {
+        type = "gpt";
+        partitions = {
+          ESP = {
+            size = "512M";
+            type = "EF00";
+            content = {
+              type = "filesystem";
+              format = "vfat";
+              mountpoint = "/boot";
+            };
+          };
+          root = {
+            size = "100%";
+            content = {
+              type = "filesystem";
+              format = "ext4";
+              mountpoint = "/";
+            };
+          };
+        };
+      };
+    };
+  };
+
+  # Bootloader
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  # Hardware: auto-detect
+  hardware.enableAllFirmware = true;
+
+  # Enable features specific to development
+  custom.development.enable = true;
+  custom.development.languages = [ "python" "nodejs" "go" ];
+
+  # ssh
+  services.openssh.enable = lib.mkDefault false;
+}