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.HealthMonitoring/ServiceCollectionExtensions.cs

@@ -26,13 +26,16 @@ public static class ServiceCollectionExtensions
     }
 
     /// <summary>
-    /// Register central-side health aggregation services.
+    /// Register central-side health aggregation services. Includes the
+    /// <see cref="CentralHealthReportLoop"/> that generates a self-report
+    /// for the central cluster so it appears on /monitoring/health.
     /// </summary>
     public static IServiceCollection AddCentralHealthAggregation(this IServiceCollection services)
     {
         services.AddSingleton<CentralHealthAggregator>();
         services.AddSingleton<ICentralHealthAggregator>(sp => sp.GetRequiredService<CentralHealthAggregator>());
         services.AddHostedService(sp => sp.GetRequiredService<CentralHealthAggregator>());
+        services.AddHostedService<CentralHealthReportLoop>();
         return services;
     }