feat: rusty-anchor WoL, auto dark/light VT theme, wakeonlan on phantom-ship 🦀

- Enable Wake-on-LAN (magic packet) on rusty-anchor enp2s0 via systemd service
- Add vt-theme script to rusty-anchor: switches between Catppuccin Latte/Mocha
- Theme state persisted in /etc/vt-theme, applied on login via profile.d
- alacritty-sync-system-theme.sh now SSHes to rusty-anchor and pushes the
  macOS light/dark change (best-effort, non-blocking, skips if unchanged)
- Add wakeonlan to phantom-ship packages (wakeonlan 00:16:cb:87:20:ba)

nixos/hosts/phantom-ship.nix

@@ -82,6 +82,7 @@ in
     git        # clone/bootstrap and dotfiles-rebuild timer
     nodejs     # npm for openclaw plugin installs
     python3    # node-gyp dependency for openclaw plugins
+    wakeonlan  # wake rusty-anchor: wakeonlan 00:16:cb:87:20:ba
   ];
 
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