Add NixOS dual-configuration setup (dev and gaming profiles)

Co-authored-by: ragusa-it <196988693+ragusa-it@users.noreply.github.com>

hosts/hostname/hardware-configuration.nix

@@ -0,0 +1,42 @@
+# This is a placeholder hardware-configuration.nix file.
+# 
+# IMPORTANT: Replace this file with your actual hardware-configuration.nix
+# generated during NixOS installation, typically found at:
+#   /etc/nixos/hardware-configuration.nix
+#
+# To generate a new hardware configuration, run:
+#   sudo nixos-generate-config --show-hardware-config > hardware-configuration.nix
+#
+# This placeholder will NOT work for actual system builds.
+
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  # Example boot configuration (replace with your actual hardware)
+  boot.initrd.availableKernelModules = [ "nvme" "xhci_pci" "ahci" "usbhid" "sd_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+
+  # Example filesystem configuration (replace with your actual mounts)
+  # fileSystems."/" = {
+  #   device = "/dev/disk/by-uuid/YOUR-ROOT-UUID";
+  #   fsType = "ext4";
+  # };
+  # 
+  # fileSystems."/boot" = {
+  #   device = "/dev/disk/by-uuid/YOUR-BOOT-UUID";
+  #   fsType = "vfat";
+  # };
+  # 
+  # swapDevices = [
+  #   { device = "/dev/disk/by-uuid/YOUR-SWAP-UUID"; }
+  # ];
+
+  # CPU microcode updates for AMD
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}