refactor: create glue/ and variants/ directories

- Add glue/ for fleet generation logic and common configuration
- Add variants/ for hardware type modules
- Improves separation of concerns and module organization

variants/nix-lxc.nix

@@ -0,0 +1,61 @@
+# ============================================================================
+# Proxmox LXC Container Configuration
+# ============================================================================
+# Configuration for lightweight Linux containers running in Proxmox.
+# Disables boot/disk management and enables remote development support.
+
+{ inputs, ... }:
+{
+  config,
+  lib,
+  modulesPath,
+  ...
+}:
+{
+  imports = [
+    inputs.vscode-server.nixosModules.default
+    "${modulesPath}/virtualisation/proxmox-lxc.nix"
+  ];
+
+  # ========== Nix Configuration ==========
+  nix.settings.trusted-users = [
+    "root"
+    "engr-ugaif"
+  ];
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
+
+  # ========== Container-Specific Configuration ==========
+  boot.isContainer = true;
+  boot.loader.systemd-boot.enable = lib.mkForce false; # No bootloader in container
+  disko.enableConfig = lib.mkForce false; # No disk management in container
+  console.enable = true;
+
+  # Allow getty to work in containers
+  systemd.services."getty@".unitConfig.ConditionPathExists = [
+    ""
+    "/dev/%I"
+  ];
+
+  # Suppress unnecessary systemd units for containers
+  systemd.suppressedSystemUnits = [
+    "dev-mqueue.mount"
+    "sys-kernel-debug.mount"
+    "sys-fs-fuse-connections.mount"
+  ];
+
+  # ========== Remote Development ==========
+  services.vscode-server.enable = true;
+
+  # ========== System Configuration ==========
+  system.stateVersion = "25.11";
+  athenix.host.buildMethods = lib.mkDefault [
+    "lxc" # LXC container tarball
+    "proxmox" # Proxmox VMA archive
+  ];
+
+  athenix.sw.enable = lib.mkDefault true;
+  athenix.sw.type = lib.mkDefault "headless";
+}