fix(gateway): replace UUID filter with manufacturer data preamble filter

gateway/gateway.py

@@ -41,6 +41,7 @@ class Gateway:
         )
 
         # Authentication — username from config, password from environment variable
+        # The password is never stored in config files or source code
         username = config["mqtt"].get("username")
         password = os.environ.get("MQTT_PASSWORD")
         if username: