Move nix code into separate files and directory and create basic module

nix/module-test.nix

@@ -0,0 +1,49 @@
+{
+  pkgs,
+  lib,
+  modulesPath,
+  ...
+}:
+{
+  imports = [
+    "${modulesPath}/virtualisation/qemu-vm.nix"
+    ./module.nix
+  ];
+
+  networking = {
+    hostName = "archtika-module-test";
+    firewall.enable = false;
+  };
+
+  nix.settings.experimental-features = [ "nix-command flakes" ];
+
+  users.users.dev = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" ];
+    password = "dev";
+  };
+
+  virtualisation = {
+    graphics = false;
+    # Alternatively a bridge network for QEMU could be setup, but requires much more effort
+    forwardPorts = [
+      {
+        from = "host";
+        host.port = 13000;
+        guest.port = 3000;
+      }
+      {
+        from = "host";
+        host.port = 14000;
+        guest.port = 4000;
+      }
+    ];
+  };
+
+  services.archtika = {
+    enable = true;
+    jwtSecret = "test-secret";
+  };
+
+  system.stateVersion = "24.05";
+}