fix: Simulateur MQTT 3/4 + OpenRemote master + Mapsettings

- MQTT OK: 3/4 (EMQX, Mosquitto, BunkerM)
- OpenRemote: utilise realm master (token fonctionnel)
- Realm smartcity recréé dans Keycloak
- Assets IOTSensor créés dans master (30) et smartcity (30)
- Mapsettings: layers iot-sensors + labels pour master et smartcity
- INTERVAL=5s, réseau openremote_default ajouté
- Dockerfile: --no-cache rebuild

import_docker_dashboard.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+import json
+import requests
+
+# Read the Docker Metrics dashboard
+with open('/home/eric/smart-city-digital-twin-martinique/grafana-dashboard-docker-metrics.json', 'r') as f:
+    dashboard = json.load(f)
+
+# Import to Grafana
+url = "https://grafana.digitribe.fr/api/dashboards/db"
+auth = ('admin', 'Digitribe972')
+
+payload = {
+    "dashboard": dashboard,
+    "overwrite": True
+}
+
+try:
+    resp = requests.post(url, json=payload, auth=auth, verify=False)
+    print(f"Status: {resp.status_code}")
+    print(resp.json())
+except Exception as e:
+    print(f"Error: {e}")