Confluence/Jira roles: add READMEs, switch to custom images, proxy/JVM envs, and integer-safe heap sizing

Confluence: README added; demo disables OIDC/LDAP; Dockerfile overlay; docker-compose now uses CONFLUENCE_CUSTOM_IMAGE and DB depends include; env.j2 adds ATL_* and JVM_*; vars use integer math (//) for Xmx/Xms and expose CUSTOM_IMAGE.

Jira: initial role skeleton with README, config/meta/tasks; Dockerfile overlay; docker-compose using JIRA_CUSTOM_IMAGE and DB depends include; env.j2 with proxy + JVM envs; vars with integer-safe memory sizing.

Context: https://chatgpt.com/share/68b6b592-2250-800f-b68e-b37ae98dbe70

roles/web-app-jira/meta/main.yml

@@ -0,0 +1,20 @@
+galaxy_info:
+  author: "Kevin Veen-Birkenbach"
+  description: "Jira Software is Atlassian’s issue & project tracking platform. This role deploys Jira in Docker, adds optional OIDC support, and integrates with the Infinito.Nexus ecosystem."
+  license: "Infinito.Nexus NonCommercial License"
+  license_url: "https://s.infinito.nexus/license"
+  company: | 
+    Kevin Veen-Birkenbach
+    Consulting & Coaching Solutions
+    https://www.veen.world
+  galaxy_tags: []
+  repository: "https://s.infinito.nexus/code"
+  issue_tracker_url: "https://s.infinito.nexus/issues"
+  documentation: "https://s.infinito.nexus/code/"
+  logo:
+    class: "fas fa-diagram-project"
+  run_after:
+    - web-app-matomo
+    - web-app-keycloak
+    - web-app-mailu
+dependencies: []