fix(distro): fix /etc/nixos ownership, theme discovery, and CLI wrappers

- installer: set recursive ownership of /etc/nixos to main user post-install
- themes: fix NOMARCHY_PATH and discovery logic for Lua theme menu
- scripts: update CLI wrappers (font, theme, wallpaper) to use Walker menus
- core: remove obsolete NOMARCHY_PATH and cleanup dead code
- features: add pkgs.lua for Walker and remove obsolete switcher.nix
- docs: update ROADMAP.md, SCRIPTS.md and STRUCTURE.md

features/scripts/utils/nomarchy-windows-vm

@@ -40,12 +40,6 @@ install_windows() {
 
   mkdir -p "$HOME/.windows"
   mkdir -p "$HOME/.config/windows"
-  mkdir -p "$HOME/.local/share/applications/icons"
-
-  # Install Windows VM icon and desktop file
-  if [[ -f $NOMARCHY_PATH/applications/icons/windows.png ]]; then
-    cp "$NOMARCHY_PATH/applications/icons/windows.png" "$HOME/.local/share/applications/icons/windows.png"
-  fi
 
   cat << EOF | tee "$HOME/.local/share/applications/windows-vm.desktop" > /dev/null
 [Desktop Entry]