printers low-toner alerts; geenforce display readiness + token scope-binding; air-gap docker deploy kit

.env.example

@@ -49,6 +49,10 @@ MYSQL_ROOT_PASSWORD=CHANGE_ME_ROOT_PASSWORD
 MYSQL_PASSWORD=CHANGE_ME_APP_PASSWORD
 MYSQL_PORT=3306
 API_PORT=5001
+# Air-gapped deploy only (docker-compose.airgap.yml): the loaded image tag,
+# which MUST match what build-offline-bundle.ps1 -Version produced. Ignored by
+# the connected build template (docker-compose.yml builds from source).
+IMAGE_TAG=0.7.0
 
 # ---- Zabbix integration (optional, for printer supply monitoring) ----
 ZABBIX_URL=