feat(keycloak): implement SPOT with Realm

Replace 01_import.yml with 01_initialize.yml (KEYCLOAK_HOST_IMPORT_DIR)
Add generic 02_update.yml (kcadm updater for clients/components)
- Resolve ID → read current → merge (kc_merge_path optional)
- Preserve immutable fields; support kc_force_attrs
Update tasks/main.yml:
- Readiness via KEYCLOAK_MASTER_REALM_URL; kcadm login
- Merge LDAP component config from Realm when KEYCLOAK_LDAP_ENABLED
- Update client settings incl. frontchannel.logout.url
realm.json.j2: include ldap.json in UserStorageProvider
ldap.json.j2: use KEYCLOAK_LDAP_* vars for bindDn/credential/connectionUrl
vars/main.yml: add KEYCLOAK_* URLs/dirs and KEYCLOAK_DICTIONARY_REALM(_RAW)
docker-compose.yml.j2: mount KEYCLOAK_HOST_IMPORT_DIR
Cleanup: remove 02_update_client_redirects.yml, 03_update-ldap-bind.yml, 04_ssh_public_key.yml; drop obsolete config flag; formatting

Note: redirectUris/webOrigins ordering may still cause changed=true; consider sorting for stability in a follow-up.

roles/web-app-keycloak/templates/docker-compose.yml.j2

@@ -8,7 +8,7 @@
     ports:
       - "{{ KEYCLOAK_SERVER_HOST }}:8080"
     volumes:
-      - "{{ keycloak_host_import_directory }}:{{KEYCLOAK_DOCKER_IMPORT_DIR}}"
+      - "{{ KEYCLOAK_HOST_IMPORT_DIR }}:{{KEYCLOAK_DOCKER_IMPORT_DIR}}"
 {% include 'roles/docker-container/templates/depends_on/dmbs_excl.yml.j2' %}
 {% include 'roles/docker-container/templates/networks.yml.j2' %}
 {% set container_port = 9000 %}