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/config/main.yml

@@ -1,10 +1,9 @@
 actions:
   import_realm:       True     # Import REALM
-  update_ldap_bind:   True     # Updates LDAP binds
 features:
   matomo:             true
   css:                true
-  desktop:    true
+  desktop:            true
   ldap:               true
   central_database:   true
   recaptcha:          true