add more immich control options

src/mqttcontroller.h

@@ -24,9 +24,10 @@ signals:
   void nextImage();
   void nextFolder();
   void restart();
+  void immichControl(const QString &payload);
 
 private slots:
-  void handleCommand(const QString &payload);
+  void handleMessage(const QString &topic, const QString &payload);
 
 private:
   static void HandleConnect(struct mosquitto *mosq, void *userdata, int rc);
@@ -35,6 +36,8 @@ private:
   void subscribe();
 
   MqttConfig config;
+  QString controlTopic;
+  QString immichTopic;
   struct mosquitto *client = nullptr;
   bool connected = false;
 };