fix(simulator): add async threads for FROST/Orion/Stellio

- Non-blocking calls via threading for external brokers
- FROST_URL fixed: frost_http-web-1:8080
- Healthcheck uses Python (no wget/curl)
- InfluxDB writes no longer blocked by slow brokers

✅ Simulator now HEALTHY with async broker calls

simulator.py

@@ -43,7 +43,7 @@ OR_ADMIN_USER = os.environ.get("OR_ADMIN_USER", "admin")
 OR_ADMIN_PASS = os.environ.get("OR_ADMIN_PASS", "Digitribe972")
 OR_REALM     = os.environ.get("OR_REALM", "smartcity")
 OR_TOKEN_REALM = os.environ.get("OR_TOKEN_REALM", "master")  # Realm pour obtention token
-FROST_URL    = os.environ.get("FROST_URL", "http://192.168.208.3:8080/FROST-Server/v1.1")
+FROST_URL    = os.environ.get("FROST_URL", "http://frost_http-web-1:8080/FROST-Server/v1.1")
 
 SENSOR_COUNTS = {
     "traffic":    int(os.environ.get("SENSOR_COUNT_traffic",    "3")),