feat(site): DeploymentManagerActor fetches config then applies (notify-and-fetch)

src/ZB.MOM.WW.ScadaBridge.Host/Actors/AkkaHostedService.cs

@@ -839,6 +839,12 @@ akka {{
 
         _logger.LogInformation("SiteReplicationActor created and S&F replication handler wired");
 
+        // Notify-and-fetch (Task 10): the active singleton fetches a deployment's
+        // flattened config from central over HTTP when a RefreshDeploymentCommand
+        // arrives. Resolve the fetcher from the same provider the actor already uses.
+        var deploymentConfigFetcher =
+            _serviceProvider.GetService<ZB.MOM.WW.ScadaBridge.SiteRuntime.Deployment.IDeploymentConfigFetcher>();
+
         // Create the Deployment Manager as a cluster singleton
         var singletonProps = ClusterSingletonManager.Props(
             singletonProps: Props.Create(() => new DeploymentManagerActor(
@@ -851,7 +857,9 @@ akka {{
                 dclManager,
                 replicationActor,
                 siteHealthCollector,
-                _serviceProvider)),
+                _serviceProvider,
+                null,
+                deploymentConfigFetcher)),
             terminationMessage: PoisonPill.Instance,
             settings: ClusterSingletonManagerSettings.Create(_actorSystem!)
                 .WithRole(siteRole)