fix(mpc-service): reduce Kafka session timeout from 5min to 30s

backend/services/mpc-service/src/infrastructure/messaging/kafka/event-consumer.service.ts

@@ -67,10 +67,10 @@ export class EventConsumerService implements OnModuleInit, OnModuleDestroy {
 
     this.consumer = this.kafka.consumer({
       groupId,
-      sessionTimeout: 300000, // 5 minutes - MPC keygen can take a while
-      heartbeatInterval: 10000, // 10 seconds
+      sessionTimeout: 30000, // 30 seconds - enough for normal operations
+      heartbeatInterval: 3000, // 3 seconds
       maxWaitTimeInMs: 5000,
-      rebalanceTimeout: 300000, // 5 minutes
+      rebalanceTimeout: 60000, // 60 seconds - for MPC operations
     });
 
     try {