chore: unify HA manufacturer and add refactor guards

src/mqtt_client.cpp

@@ -114,7 +114,7 @@ static bool publish_discovery_sensor(const char *device_id, const char *key, con
   identifiers.add(String(device_id));
   device["name"] = String(device_id);
   device["model"] = "DD3-LoRa-Bridge";
-  device["manufacturer"] = "AcidBurns";
+  device["manufacturer"] = HA_MANUFACTURER;
 
   String payload;
   size_t len = serializeJson(doc, payload);