fix(adminui): bound the diagnostics marker payload on both the endpoint and the circuit (D-a review r1)

I-1 - a non-C# paste produced thousands of Roslyn markers. The Problems-list report sent
them all as one JS->.NET message, which could exceed the 1 MB hub limit and kill the
circuit. The JS now sends at most MaxReportedMarkers (200) markers, errors first, each
message cut to 300 chars, plus the total. ScriptProblemReport.FromEditor clamps again
on arrival, and the Problems list shows "showing N of Total" / "+N more". The diagnostics
endpoint also bounds its response: Distinct, errors first, MaxDiagnosticMarkers (1000),
messages cut to 1000 chars. An error is always kept, so editor-accepts == publish-accepts.

M-1 - drop the per-instance compilation lineage; analyses derive from BaseCompilation.
M-2 - the VirtualTag modal clears its problems (and editor ref) on close and on a script
reload.
M-5 - an over-limit text is announced at blur (OnSyncRefused), not only at Save.

Refs #745

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

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/ScriptEdit.razor

@@ -62,7 +62,7 @@ else
             <div style="padding:1rem">
                 <MonacoEditor @ref="_editor" @bind-Value="_form.SourceCode" Height="420px"
                               MarkersChanged="OnMarkersChanged" />
-                <ScriptProblemsList Markers="_markers" OnSelect="RevealProblemAsync" />
+                <ScriptProblemsList Report="_markers" OnSelect="RevealProblemAsync" />
                 <div class="form-text">SHA-256 hash is computed automatically on save.</div>
             </div>
         </section>
@@ -90,9 +90,9 @@ else
     private bool _busy;
     private string? _error;
     private MonacoEditor? _editor;
-    private IReadOnlyList<DiagnosticMarker> _markers = Array.Empty<DiagnosticMarker>();
+    private ScriptProblemReport _markers = ScriptProblemReport.Empty;
 
-    private void OnMarkersChanged(IReadOnlyList<DiagnosticMarker> markers) => _markers = markers;
+    private void OnMarkersChanged(ScriptProblemReport report) => _markers = report;
 
     private Task RevealProblemAsync(DiagnosticMarker m)
         => _editor is null ? Task.CompletedTask : _editor.RevealLineAsync(m.StartLineNumber, m.StartColumn);