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/ScriptAnalysis/ScriptAnalysisService.cs

@@ -551,9 +551,4 @@ public sealed class ScriptAnalysisService
             return new FormatResponse(req.Code);
         }
     }
-    /// <summary>Returns editor inlay hints for the script. Currently a no-op (always empty) — the endpoint
-    /// exists for future use but the feature is not implemented.</summary>
-    /// <param name="req">The inlay-hints request (unused).</param>
-    /// <returns>An always-empty inlay-hints response.</returns>
-    public InlayHintsResponse InlayHints(InlayHintsRequest req) => new(Array.Empty<InlayHint>());
 }