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-phpmyadmin/config/main.yml

@@ -3,7 +3,7 @@ oauth2_proxy:
   port:               "80"
   application:        "application"
   allowed_groups:
-    - "/roles/web-app-phpmyadmin-administrator"
+    - "{{ [RBAC.GROUP.NAME, 'web-app-phpmyadmin-administrator'] | path_join }}"
 features:
   matomo:             true
   css:                false