refactor: archive old features directory to features.old

The new profile-based structure (home/base, home/desktop, home/server,
home/profiles/, home/coding) is fully operational and imported via
home/lib/mkHomeConfig. The legacy home/features directory is no longer
referenced anywhere in the configuration.

Archived rather than deleted to preserve history for reference.

home/features.old/desktop/wayland.nix

@@ -0,0 +1,29 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.features.desktop.wayland;
+in {
+  options.features.desktop.wayland.enable = mkEnableOption "wayland extra tools and config";
+
+  config = mkIf cfg.enable {
+    home.packages = with pkgs; [
+      grim
+      hyprcursor
+      hyprlock
+      hyprpaper
+      qt6.qtwayland
+      slurp
+      waypipe
+      wl-clipboard
+      wf-recorder
+      wl-mirror
+      wlogout
+      wtype
+      ydotool
+    ];
+  };
+}