fix(adminui): Monaco text syncs on demand, diagnostics are sequenced, Problems list (D1)

R04:P1 - the editor no longer ships its full text JS->.NET on every keystroke. It reports
at blur, and ScriptEdit / the VirtualTag modal read the authoritative value with
MonacoEditor.GetValueAsync at Save (validation runs after the pull). The Blazor hub's
MaximumReceiveMessageSize is raised from 32 KB to 1 MB. The JS refuses a value that
would not fit instead of sending an oversize frame, and Save surfaces that refusal
rather than persisting stale source.

R04:P9 - diagnostics carry a generation counter and an AbortController. Every edit aborts
the in-flight request, and only the response for the current text is applied.

R04:S2 - the always-empty inlay-hints provider, endpoint, service method and contracts
are removed.

R04:S3 - MarkersChanged is typed (DiagnosticMarker) and feeds a new ScriptProblemsList.
Clicking a problem calls RevealLineAsync. Markers cross to .NET only when a list
subscribes.

Refs #745

Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/EndpointRouteBuilderExtensions.cs

@@ -53,7 +53,7 @@ public static class EndpointRouteBuilderExtensions
     /// <returns>The same service collection, for chaining.</returns>
     public static IServiceCollection AddAdminUI(this IServiceCollection services)
     {
-        services.AddRazorComponents().AddInteractiveServerComponents();
+        services.AddRazorComponents().AddInteractiveServerComponents().AddHubOptions(o => o.MaximumReceiveMessageSize = ScriptAnalysis.ScriptEditorLimits.HubMaximumReceiveMessageSize);
         services.AddOtOpcUaDriverStatusServices();
 
         // Secrets-management UI (ZB.MOM.WW.Secrets.Ui RCL, mounted at /admin/secrets). Register its