fix(site-runtime): wire EventLogHandlerActor so site event log queries work

The SiteCommunicationActor expected an event log handler but none was
registered, causing "Event log handler not available" on the Event Logs
page and CLI. Bridge IEventLogQueryService to Akka via a simple actor.

src/ScadaLink.Host/Actors/AkkaHostedService.cs

@@ -302,6 +302,16 @@ akka {{
         // Register local handlers with SiteCommunicationActor
         siteCommActor.Tell(new RegisterLocalHandler(LocalHandlerType.Artifacts, dmProxy));
 
+        // Event log handler — bridges Akka to IEventLogQueryService
+        var eventLogQueryService = _serviceProvider.GetService<SiteEventLogging.IEventLogQueryService>();
+        if (eventLogQueryService != null)
+        {
+            var eventLogHandler = _actorSystem.ActorOf(
+                Props.Create(() => new SiteEventLogging.EventLogHandlerActor(eventLogQueryService)),
+                "event-log-handler");
+            siteCommActor.Tell(new RegisterLocalHandler(LocalHandlerType.EventLog, eventLogHandler));
+        }
+
         // Register SiteCommunicationActor with ClusterClientReceptionist so central ClusterClients can reach it
         ClusterClientReceptionist.Get(_actorSystem).RegisterService(siteCommActor);