rt1(z9 host): create host and configure networkd and nftables

inventories/z9/hosts.yaml

@@ -15,6 +15,9 @@ all:
     yate:
       ansible_host: yate.z9.ccchh.net
       ansible_user: chaos
+    rt1:
+      ansible_host: rt1.ccchh.net
+      ansible_user: chaos
 certbot_hosts:
   hosts:
     light:
@@ -34,6 +37,7 @@ infrastructure_authorized_keys_hosts:
     light:
     waybackproxy:
     yate:
+    rt1:
 nginx_hosts:
   hosts:
     light:
@@ -47,6 +51,12 @@ transmission:
 proxmox_vm_template_hosts:
   hosts:
     thinkcccore0:
+systemd_networkd_hosts:
+  hosts:
+    rt1:
+nftables_hosts:
+  hosts:
+    rt1:
 alloy_hosts:
   hosts:
     light:
@@ -60,5 +70,6 @@ ansible_pull_hosts:
     yate:
 secrets_hosts:
   hosts:
+    rt1:
 forgejo_runner_hosts:
   hosts: