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/scopes/rbac.json.j2

@@ -1,5 +1,5 @@
 {
-  "name": "{{ KEYCLOAK_OIDC_RBAC_SCOPE_NAME }}",
+  "name": "{{ KEYCLOAK_RBAC_GROUP_CLAIME }}",
   "description": "RBAC Groups",
   "protocol": "openid-connect",
   "attributes": {
@@ -22,7 +22,7 @@
         "id.token.claim": "true",
         "lightweight.claim": "false",
         "access.token.claim": "true",
-        "claim.name": "{{ OIDC.CLAIMS.GROUPS }}"
+        "claim.name": "{{ KEYCLOAK_RBAC_GROUP_CLAIME }}"
       }
     }
   ]