xwiki: switch to PostgreSQL and remove custom Hibernate override

Config: set database.type=postgres; use image tag lts-<dbtype>-tomcat; make DB_TYPE templated; derive database_type from app config.

Cleanup: delete hibernate.cfg.xml template and volume mounts; remove XWIKI_HOST_HIBERNATE_PATH; stop rendering hibernate.cfg.xml.

web-svc-cdn: run_once task fix.

Context: troubleshooting on 2025-09-12. Conversation link: https://chatgpt.com/share/68c3978e-77cc-800f-beda-19220f70855f

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

@@ -15,4 +15,6 @@
   template:
     src: "nginx.conf.j2"
     dest: "{{ CDN_NGINX_PATH }}"
-  notify: restart openresty
+  notify: restart openresty
+
+- include_tasks: utils/run_once.yml

roles/web-svc-cdn/tasks/main.yml

@@ -1,6 +1,5 @@
 - block:
   - include_tasks: 01_core.yml
-  - include_tasks: utils/run_once.yml
   when: run_once_web_svc_cdn is not defined
 
 - include_tasks: "{{ playbook_dir }}/tasks/utils/load_handlers.yml"