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/ScriptEditorLimits.cs

@@ -0,0 +1,19 @@
+namespace ZB.MOM.WW.OtOpcUa.AdminUI.ScriptAnalysis;
+
+/// <summary>Size limits for moving Monaco editor text across the Blazor Server circuit.</summary>
+/// <remarks>
+///     The editor text crosses JS → .NET only on demand (at blur and when a page saves), never per keystroke. Each
+///     crossing is ONE SignalR message, bounded by the Blazor hub's <c>MaximumReceiveMessageSize</c>. The framework
+///     default is 32 KB, which silently lost any larger script (the oversize invoke failed and Save persisted the
+///     stale source), so <c>AddAdminUI</c> raises it to <see cref="HubMaximumReceiveMessageSize"/>. The editor JS
+///     refuses to send a value whose serialized form exceeds <see cref="MaxEditorSyncBytes"/> — an oversize frame
+///     would tear the circuit down — and the save surfaces that refusal to the author instead.
+/// </remarks>
+public static class ScriptEditorLimits
+{
+    /// <summary>The Blazor hub's receive limit, in bytes (1 MB).</summary>
+    public const long HubMaximumReceiveMessageSize = 1024 * 1024;
+
+    /// <summary>The largest serialized editor value the JS will send, leaving 64 KB of frame headroom.</summary>
+    public const int MaxEditorSyncBytes = (int)HubMaximumReceiveMessageSize - 64 * 1024;
+}