Generate WordPress compose from the site list during provision.

Each host mounts wp-content and gets a compose file from inventory instead of a hand-copied one. Also allow LAN TCP 8020 so abc_voice is reachable through UFW.

playbooks/site.yml

@@ -13,6 +13,9 @@
     - nodejs
     - gitea-key
     - tianji
+    # NFS wp-content and generated compose for inventory/wordpress_sites.yml.
+    - role: wordpress
+      tags: [wordpress]
 
 - name: Provision central observability stack
   hosts: ai-server-4080