fix: update @push.rocks/smartproxy to version 19.6.1 and improve socket management in ConnectionManager

feat: enhance MetricsManager with reset interval and top domains tracking

ts/mail/delivery/classes.delivery.system.ts

@@ -221,12 +221,13 @@ export class MultiModeDeliverySystem extends EventEmitter {
         const checkInterval = setInterval(() => {
           if (this.activeDeliveries.size === 0) {
             clearInterval(checkInterval);
+            clearTimeout(forceTimeout);
             resolve();
           }
         }, 1000);
         
         // Force resolve after 30 seconds
-        setTimeout(() => {
+        const forceTimeout = setTimeout(() => {
           clearInterval(checkInterval);
           resolve();
         }, 30000);