fix(web-app-xwiki): raise XWiki container resources and align YAML formatting

- Set cpus=1.0, mem_reservation=1g, mem_limit=2g, pids_limit=1024
- Keep LTS image/tag templating and Postgres type
- Normalize spacing/alignment for readability

Reason: Tomcat/XWiki needs >1 GB; low limits caused slow boots/502 upstream not ready.
Conversation: https://chatgpt.com/share/68de5266-c8a0-800f-bfbc-de85262de53e

roles/web-app-xwiki/config/main.yml

@@ -12,6 +12,10 @@ docker:
       name:               xwiki
       backup:
         no_stop_required: true
+      cpus:               1.0
+      mem_reservation:    1g
+      mem_limit:          2g
+      pids_limit:         1024
   volumes:
     data:           "xwiki_data"
 features: