feat(scripts): realign Test Run with runtime API, add anonymous-object calls and instance binding

The Test Run sandbox and Monaco analysis modelled a script API that had
drifted from the site runtime's ScriptGlobals, so real scripts failed to
compile in Test Run. Realign both to the runtime surface
(Instance/Scripts/ExternalSystem/Attributes/Children/Parent) and drop the
duplicate ScriptHost stub so the two cannot diverge again.

- Script calls (Scripts.CallShared, Instance.CallScript, Route.To().Call)
  accept an anonymous object instead of a hand-built dictionary, via a
  shared ScriptArgs normalizer; existing dictionary calls still compile.
- Test Run can optionally bind to a deployed instance, so Instance/
  Attributes/CallScript route to it cross-site; adds site-side
  RouteToGetAttributes/RouteToSetAttributes handlers.
- Adds Test Run panels to the API method and template script editors.
- Fixes the TestDatabaseQuery seed script, which queried a table that
  never existed.

Also commits unrelated in-progress work already in the tree: the health
monitoring report loop, site streaming changes, and the Admin/Design
data-connection and SMTP page reorganization.

src/ScadaLink.Host/Program.cs

@@ -94,6 +94,14 @@ try
         builder.Services.AddSingleton<AkkaHostedService>();
         builder.Services.AddHostedService(sp => sp.GetRequiredService<AkkaHostedService>());
 
+        // Cluster node status provider scoped to the Central role — feeds the
+        // CentralHealthReportLoop so the central cluster appears on /monitoring/health.
+        builder.Services.AddSingleton<IClusterNodeProvider>(sp =>
+        {
+            var akkaService = sp.GetRequiredService<AkkaHostedService>();
+            return new AkkaClusterNodeProvider(akkaService, "Central");
+        });
+
         // Options binding
         SiteServiceRegistration.BindSharedOptions(builder.Services, builder.Configuration);
         builder.Services.Configure<SecurityOptions>(builder.Configuration.GetSection("ScadaLink:Security"));