fix(central-ui): resolve CentralUI-006 — push-based deployment status via IDeploymentStatusNotifier, remove 10s polling timer

src/ScadaLink.DeploymentManager/ServiceCollectionExtensions.cs

@@ -27,6 +27,14 @@ public static class ServiceCollectionExtensions
         // the declared option-class defaults apply.
         services.AddOptions<DeploymentManagerOptions>();
         services.AddSingleton<OperationLockManager>();
+
+        // CentralUI-006: push-based deployment-status notification. Registered
+        // as a singleton so the scoped DeploymentService and the Central UI's
+        // scoped Blazor page component share one instance — both run in the
+        // same central Host process. The deployment-status page subscribes to
+        // it instead of polling the database every 10 seconds.
+        services.AddSingleton<IDeploymentStatusNotifier, DeploymentStatusNotifier>();
+
         services.AddScoped<IFlatteningPipeline, FlatteningPipeline>();
         services.AddScoped<DeploymentService>();
         services.AddScoped<ArtifactDeploymentService>();