feat(dcrouter): Wire DNS server query events to MetricsManager for time-series tracking and bump @push.rocks/smartdns to ^7.9.0

ts/classes.dcrouter.ts

@@ -1256,6 +1256,20 @@ export class DcRouter {
     // Start the DNS server (UDP only)
     await this.dnsServer.start();
     logger.log('info', `DNS server started on UDP ${vmIpAddress}:53`);
+
+    // Wire DNS query events to MetricsManager for time-series tracking
+    if (this.metricsManager && this.dnsServer) {
+      this.dnsServer.on('query', (event: plugins.smartdns.dnsServerMod.IDnsQueryCompletedEvent) => {
+        for (const question of event.questions) {
+          this.metricsManager.trackDnsQuery(
+            question.type,
+            question.name,
+            false,
+            event.responseTimeMs,
+          );
+        }
+      });
+    }
     
     // Validate DNS configuration
     await this.validateDnsConfiguration();