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-confluence/templates/docker-compose.yml.j2

@@ -3,9 +3,7 @@
     build:
       context: .
       dockerfile: Dockerfile
-      args:
-        CONFLUENCE_BASE_IMAGE: "{{ CONFLUENCE_IMAGE }}:{{ CONFLUENCE_VERSION }}"
-    image: "{{ CONFLUENCE_IMAGE }}:{{ CONFLUENCE_VERSION }}-oidc"
+    image: "{{ CONFLUENCE_CUSTOM_IMAGE }}"
     container_name: "{{ CONFLUENCE_CONTAINER }}"
     hostname: '{{ CONFLUENCE_HOSTNAME}}'
     ports:
@@ -14,8 +12,7 @@
       - 'data:/var/atlassian/application-data/confluence'
 {% include 'roles/docker-container/templates/healthcheck/curl.yml.j2' %}
 {% include 'roles/docker-container/templates/base.yml.j2' %}
-    depends_on:
-      - database
+{% include 'roles/docker-container/templates/depends_on/dmbs_excl.yml.j2' %}
 {% include 'roles/docker-container/templates/networks.yml.j2' %}
 
 {% include 'roles/docker-compose/templates/volumes.yml.j2' %}