feat(ui): structured editors for script schemas and alarm triggers

Replace raw-JSON text inputs with rich UI: script parameter/return types use
a JSON Schema builder (SchemaBuilder + JsonSchemaShapeParser, with a migration
to convert existing definitions); alarm trigger config uses a type-aware
editor with a flattened attribute picker (AlarmTriggerEditor). AlarmActor
gains optional direction (rising/falling/either) on RateOfChange triggers.

src/ScadaLink.CentralUI/Components/Shared/MonacoEditor.razor

@@ -28,9 +28,9 @@
     [Parameter] public bool ShowToolbar { get; set; } = true;
 
     /// <summary>
-    /// Parameter names declared on the form (from the ParameterListEditor),
-    /// surfaced as completions inside Parameters["..."] literals and used by
-    /// the unknown-key diagnostic.
+    /// Parameter names declared on the form (derived from the SchemaBuilder's
+    /// JSON Schema), surfaced as completions inside Parameters["..."] literals
+    /// and used by the unknown-key diagnostic.
     /// </summary>
     [Parameter] public IReadOnlyList<string>? DeclaredParameters { get; set; }