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/templates/import/components/org.keycloak.storage.UserStorageProvider.json.j2

@@ -156,7 +156,7 @@
           "group.object.classes": [ "groupOfNames" ],
           "memberof.ldap.attribute": [ "memberOf" ],
           "drop.non.existing.groups.during.sync": [ "false" ],
-          "groups.path": [ "{{ applications | get_app_conf(application_id, 'rbac_groups', True) }}" ]
+          "groups.path": [ "{{ KEYCLOAK_RBAC_GROUP_NAME }}" ]
         }
       },
       {