fix(PortProxy): Adjust inactivity threshold to a random value between 20 and 30 minutes for better variability

ts/classes.portproxy.ts

@@ -1211,7 +1211,7 @@ export class PortProxy {
         // Skip inactivity check if disabled
         if (!this.settings.disableInactivityCheck) {
           // Inactivity check - use protocol-specific values
-          let inactivityThreshold = 180000; // 3 minutes default
+          let inactivityThreshold = Math.floor(Math.random() * (1800000 - 1200000 + 1)) + 1200000; // random between 20 and 30 minutes
           
           // Set protocol-specific inactivity thresholds
           if (record.protocolType === 'http' && record.isPooledConnection) {