feat: add NordVPN to installable services with optional GUI

- Add omarchy-install-nordvpn script that:
  - Installs nordvpn-bin from AUR
  - Enables nordvpnd daemon
  - Adds user to nordvpn group
  - Optionally installs NordVPN GUI with TUI entry
  - Detects existing GUI installation to avoid conflicts

- Add NordVPN option to Install > Service menu with 󱇱 icon

bin/omarchy-install-nordvpn

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Install the NordVPN service with optional GUI.
+
+echo "Installing NordVPN..."
+yay -S --noconfirm nordvpn-bin
+
+# Enable and start the NordVPN daemon
+echo "Enabling NordVPN daemon..."
+sudo systemctl enable --now nordvpnd
+
+# Add user to nordvpn group for unprivileged access
+echo "Adding user to nordvpn group..."
+sudo usermod -aG nordvpn $USER
+
+# Ask if user wants to install the GUI (if not already installed)
+if ! pacman -Qi nordvpn-gui &>/dev/null && ! pacman -Qi nordvpn-gui-bin &>/dev/null; then
+  if gum confirm "Would you like to install the NordVPN GUI?"; then
+    echo "Installing NordVPN GUI..."
+    yay -S --noconfirm nordvpn-gui
+    omarchy-tui-install "NordVPN" "nordvpn-gui" float https://cdn.jsdelivr.net/gh/homarr-labs/dashboard-icons/png/nordvpn.png
+  fi
+else
+  echo "NordVPN GUI is already installed."
+  # Ensure TUI entry exists
+  omarchy-tui-install "NordVPN" "nordvpn-gui" float https://cdn.jsdelivr.net/gh/homarr-labs/dashboard-icons/png/nordvpn.png
+fi
+
+echo ""
+echo "NordVPN installed! Please log out and back in for group changes to take effect."
+echo "Then run 'nordvpn login' to authenticate with your NordVPN account."