Configure for atlas/pinj and add Wayland session variables

- Rename hosts/hostname/ to hosts/atlas/
- Replace all <hostname> placeholders with 'atlas'
- Replace all <username> placeholders with 'pinj'
- Set timezone to Europe/Rome (with TODO note to change if needed)
- Set locale to en_US.UTF-8
- Add Wayland session variables (QT_QPA_PLATFORM, MOZ_ENABLE_WAYLAND,
  NIXOS_OZONE_WL) for proper app integration
- Remove placeholder comments that are no longer needed

https://claude.ai/code/session_01UAdmEkSeh9NGPfjRfViLWY

hosts/atlas/hardware-configuration.nix

@@ -0,0 +1,44 @@
+# 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 - the UUIDs below
+# are placeholders that must be replaced with your actual disk UUIDs.
+
+{ 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 = [ ];
+
+  # IMPORTANT: Replace these UUIDs with your actual disk UUIDs
+  # Find your UUIDs with: lsblk -f
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/REPLACE-WITH-YOUR-ROOT-UUID";
+    fsType = "ext4";
+  };
+
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/REPLACE-WITH-YOUR-BOOT-UUID";
+    fsType = "vfat";
+  };
+
+  swapDevices = [
+    { device = "/dev/disk/by-uuid/REPLACE-WITH-YOUR-SWAP-UUID"; }
+  ];
+
+  # CPU microcode updates for AMD
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}