Improve MQTT subscriber resilience

- Remove max reconnect attempts limit (was 10)
- MQTT subscriber now retries indefinitely until connection succeeds
- Reduce log spam by logging only first 10 attempts, then every 10th
- Prevents permanent connection loss after temporary network issues

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/mqtt-subscriber.ts

@@ -20,7 +20,6 @@ interface OwnTracksMessage {
 class MQTTSubscriber {
   private client: mqtt.MqttClient | null = null;
   private reconnectAttempts = 0;
-  private maxReconnectAttempts = 10;
   private isConnecting = false;
 
   constructor(
@@ -80,11 +79,9 @@ class MQTTSubscriber {
 
     this.client.on('reconnect', () => {
       this.reconnectAttempts++;
-      console.log(`Reconnecting to MQTT broker (attempt ${this.reconnectAttempts}/${this.maxReconnectAttempts})`);
-
-      if (this.reconnectAttempts >= this.maxReconnectAttempts) {
-        console.error('Max reconnect attempts reached, giving up');
-        this.client?.end();
+      // Log less frequently to avoid spam (every 10th attempt after attempt 10)
+      if (this.reconnectAttempts <= 10 || this.reconnectAttempts % 10 === 0) {
+        console.log(`Reconnecting to MQTT broker (attempt ${this.reconnectAttempts})`);
       }
     });