Fix XWiki automation bootstrap:

- Accept HTTP 302 (Distribution Wizard redirects) in REST readiness and extension checks
- Treat 302 as missing admin user during bootstrap
- Move superadmin password to xwiki.cfg (correct location)
- Disable automatic Distribution Wizard start in xwiki.properties
- Standardize run_once includes for postgres, cdn, and xwiki roles

See: https://chatgpt.com/share/68c3a67b-80b4-800f-8a90-ebdcd4abb86c

roles/sys-svc-cdn/tasks/01_core.yml

@@ -27,4 +27,5 @@
     group: "{{ NGINX.USER }}"
     mode:  "0755"
   loop: "{{ CDN_DIRS_GLOBAL }}"
+
 - include_tasks: utils/run_once.yml