Extend dots.ports module to remaining NixOS hosts

- hetznix02: import shared ports, derive firewall via lib.pipe, wire
  node-exporter and nginx-exporter port references in monitoring.nix
- kiosk-entryway: import shared ports, wire node-exporter port in monitoring.nix
- kiosk-gene-desk: import shared ports, make node-exporter port explicit
- bigboy, rainbow-planet: import shared ports for consistency

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

modules/hosts/nixos/kiosk-entryway/default.nix

@@ -7,6 +7,7 @@
 }:
 {
   imports = [
+    ../../../shared/nixos/ports.nix
     ./disk-config.nix
     ./hardware-configuration.nix
     ./monitoring.nix