Fix RBAC groups handling and refactor Keycloak role

- Fixed incorrect handling of RBAC group configuration (moved from OIDC claims into dedicated RBAC variable set).
- Unified RBAC group usage across applications (LAM, pgAdmin, phpLDAPadmin, phpMyAdmin, YOURLS).
- Replaced old 'KEYCLOAK_OIDC_RBAC_SCOPE_NAME' with dedicated 'KEYCLOAK_RBAC_GROUP_*' variables.
- Updated OAuth2 Proxy configuration to use 'RBAC.GROUP.CLAIM'.
- Refactored Keycloak role task structure:
  * Renamed and reorganized task files for clarity ('_update.yml', '02_cleanup.yml', etc.).
  * Introduced meta and dependency handling separation.
- Cleaned up Keycloak config defaults and recaptcha placeholders.

roles/web-app-keycloak/tasks/04_dependencies.yml

@@ -0,0 +1,12 @@
+- block:
+  - name: "load required 'web-svc-logout' for {{ application_id }}"
+    include_role:
+      name: web-svc-logout
+      public: false
+    when: run_once_web_svc_logout is not defined
+  
+  - name: "load docker, db and proxy for {{ application_id }}"
+    include_role:
+      name: cmp-db-docker-proxy
+    vars:
+      docker_compose_flush_handlers: true