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-oauth2-proxy/templates/oauth2-proxy-keycloak.cfg.j2

@@ -15,8 +15,8 @@ provider_display_name   =   "{{ OIDC.BUTTON_TEXT }}"
 
 {% if applications | get_app_conf(oauth2_proxy_application_id, 'oauth2_proxy.allowed_groups', False) %}
 {# role based restrictions #}
-scope                   =   "openid email profile {{ OIDC.CLAIMS.GROUPS }}"
-oidc_groups_claim       =   "{{ OIDC.CLAIMS.GROUPS }}"
+scope                   =   "openid email profile {{ RBAC.GROUP.CLAIM }}"
+oidc_groups_claim       =   "{{ RBAC.GROUP.CLAIM }}"
 allowed_groups          =   {{ applications | get_app_conf(oauth2_proxy_application_id, 'oauth2_proxy.allowed_groups', True) | tojson }}
 email_domains           =   ["*"]
 {% else %}