add jetson host

hosts/nixos/jetson/hardware-configuration.nix

@@ -0,0 +1,26 @@
+# PLACEHOLDER hardware configuration for Jetson Orin Nano
+# This file should be regenerated on the actual device by running:
+#   nixos-generate-config --root /mnt
+# Then copy the generated hardware-configuration.nix to this location.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  # These are placeholder kernel modules - will be auto-detected by nixos-generate-config
+  boot.initrd.availableKernelModules = [ "nvme" "usb_storage" "usbhid" "sd_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  # Filesystems are managed by disko configuration
+  # No filesystem declarations needed here
+
+  # Enable DHCP on network interfaces
+  networking.useDHCP = lib.mkDefault true;
+
+  # ARM64 platform for Jetson Orin Nano
+  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
+}