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/IClusterNodeProvider.cs

@@ -9,4 +9,11 @@ namespace ScadaLink.HealthMonitoring;
 public interface IClusterNodeProvider
 {
     IReadOnlyList<NodeStatus> GetClusterNodes();
+
+    /// <summary>
+    /// True when this node is currently the cluster leader (Primary) for the
+    /// provider's role scope. Used by the central report loop to decide which
+    /// node should generate the "central" health report.
+    /// </summary>
+    bool SelfIsPrimary { get; }
 }