refactor: update imports to use glue/ and variants/

- flake.nix: import glue/fleet.nix instead of hosts/
- installer/artifacts.nix: use 'fleet' parameter instead of 'hosts'
- installer/modules.nix: auto-import from variants/ directory

installer/modules.nix

@@ -6,40 +6,23 @@
 #
 # Usage in another flake:
 #   # Full host type configurations (includes hardware + software + system config)
-#   inputs.nixos-systems.nixosModules.nix-desktop
-#   inputs.nixos-systems.nixosModules.nix-laptop
+#   inputs.athenix.nixosModules.nix-desktop
+#   inputs.athenix.nixosModules.nix-laptop
 #
-#   # Software-only configurations (for custom hardware setups)
-#   # Note: These include theme.nix in home-manager.sharedModules automatically
-#   inputs.nixos-systems.nixosModules.sw-desktop
-#   inputs.nixos-systems.nixosModules.sw-headless
-#
-#   # Home Manager modules (user-level configuration)
-#   # Theme module (no parameters):
-#   home-manager.users.myuser.imports = [ inputs.nixos-systems.homeManagerModules.theme ];
-#
-#   # Neovim module (requires user parameter):
-#   home-manager.users.myuser.imports = [
-#     (inputs.nixos-systems.homeManagerModules.nvim {
-#       user = config.athenix.users.accounts.myuser;
-#     })
-#   ];
+#   # Software-only configuration (for custom hardware setups)
+#   inputs.athenix.nixosModules.sw
 
 { inputs }:
-{
-  # ========== Full Host Type Modules ==========
-  # Complete system configurations including hardware, boot, and software
-  nix-desktop = import ../hosts/types/nix-desktop.nix { inherit inputs; }; # Desktop workstations
-  nix-laptop = import ../hosts/types/nix-laptop.nix { inherit inputs; }; # Laptop systems
-  nix-surface = import ../hosts/types/nix-surface.nix { inherit inputs; }; # Surface tablets
-  nix-lxc = import ../hosts/types/nix-lxc.nix { inherit inputs; }; # Proxmox containers
-  nix-wsl = import ../hosts/types/nix-wsl.nix { inherit inputs; }; # WSL2 systems
-  nix-ephemeral = import ../hosts/types/nix-ephemeral.nix { inherit inputs; }; # Diskless/RAM-only
-
-  # ========== Software Configuration Module ==========
-  # Main software module with all athenix.sw options
+# Automatically import all variant modules from variants/ directory
+# This returns an attribute set like: { nix-desktop = ...; nix-laptop = ...; nix-lxc = ...; sw = ...; }
+(import ../variants { inherit inputs; })
+// {
+  # Software configuration module - main module with all athenix.sw options
   # Use athenix.sw.type to select profile: "desktop", "tablet-kiosk", "headless", "stateless-kiosk"
-  # Use athenix.sw.extraPackages to add additional packages
-  # Use athenix.sw.kioskUrl to set kiosk mode URL
-  sw = { inputs, ... }@args: (import ../sw/default.nix (args // { inherit inputs; }));
+  sw =
+    {
+      inputs,
+      ...
+    }@args:
+    (import ../sw/default.nix (args // { inherit inputs; }));
 }