feat: port Phase 1 foundational modules and setup comin in flake.nix

modules/virtualisation/default.nix

@@ -0,0 +1,5 @@
+{
+  imports = [
+    ./guest
+  ];
+}

modules/virtualisation/guest/default.nix

@@ -0,0 +1,34 @@
+{ config, lib, modulesPath, ... }:
+
+let
+  cfg = config.homelab.virtualisation.guest;
+in {
+  options.homelab.virtualisation.guest.enable = lib.mkEnableOption "Settings for devices running on virtualisation, e.g. Proxmox";
+
+  imports = [
+    (modulesPath + "/profiles/qemu-guest.nix")
+  ];
+
+  config = lib.mkIf cfg.enable {
+    boot = {
+      # Whether to enable growing the root partition on boot.
+      growPartition = true;
+      # Use Grub bootloader
+      loader.grub = {
+        enable = true;
+        devices = [
+          "nodev"
+        ];
+      };
+    };
+
+    fileSystems."/" = lib.mkDefault {
+      device = "/dev/disk/by-label/nixos";
+      autoResize = true;
+      fsType = "ext4";
+    };
+
+    # Enable QEMU Guest for Proxmox
+    services.qemuGuest.enable = true;
+  };
+}