fix Skoda MQTT: refresh token on 'Not authorized' instead of blind reconnect

Like HA's _on_pre_connect_callback pattern: when broker rejects with
"Not authorized", stop the client and trigger an immediate token refresh
rather than reconnecting 10x with the same expired access token.
Also register FCM token with Skoda only once (not on every token refresh).

Author: TA2k

main.js

@@ -2916,7 +2916,10 @@ class VwWeconnect extends utils.Adapter {
         return;
       }
       this.fcmToken = fcmToken;
-      await this.registerFcmTokenWithSkoda(fcmToken);
+      if (!this.fcmTokenRegistered) {
+        await this.registerFcmTokenWithSkoda(fcmToken);
+        this.fcmTokenRegistered = true;
+      }
     } catch (error) {
       this.log.error("MQTT: FCM registration failed: " + error.message);
       return;
@@ -2977,6 +2980,11 @@ class VwWeconnect extends utils.Adapter {
     });
     this.mqttClient.on("error", (error) => {
       this.log.error("MQTT Error: " + error);
+      if (error && error.message && error.message.includes("Not authorized")) {
+        this.log.info("MQTT: Not authorized - triggering token refresh");
+        this.mqttClient.end();
+        this.refreshSkodaEToken().catch(() => {});
+      }
     });
     this.mqttClient.on("close", () => {
       this.log.info("MQTT Connection closed");