feat(centralui+dcl): Test Bindings popup — one-shot live read of bound tags

Adds a Test Bindings button to the Connection Bindings table on the Configure
Instance page that opens a modal showing the live current value of every bound
attribute. Reuses the routing path that the OPC UA tag browser landed on:

  Central:  TestBindingsDialog → IBindingTester → CommunicationService
            → ReadTagValuesCommand → SiteEnvelope (Ask)
  Site:     SiteCommunicationActor → DeploymentManagerActor singleton
            → DataConnectionManagerActor → child DataConnectionActor
            → _adapter.ReadBatchAsync

Split mirrors the browse handler:
  • Manager owns ConnectionNotFound (only it sees the per-site connection set).
  • Child owns ConnectionNotConnected (pre-call status check, never stash —
    read is interactive design-time), Timeout (OperationCanceledException),
    ServerError (any other exception). Per-tag failures from ReadBatchAsync
    become failure TagReadOutcomes without aborting the batch.

CentralUI:
  • IBindingTester / BindingTester — Design-role guard via HasClaim against
    JwtTokenService.RoleClaimType (not IsInRole — see c1e16cf), typed
    transport-failure translation.
  • TestBindingsDialog — ShowAsync(siteId, rows, instanceLabel) method-arg
    pattern (no Razor parameter race; see 2c138b6), groups rows by connection
    and issues one ReadAsync per connection in parallel, per-row error subline
    + per-connection banner, Refresh button re-issues the reads.
  • InstanceConfigure.razor — Test Bindings button next to Save Bindings,
    disabled when no testable rows. OPC UA only today (other protocols have
    no ReadTagValuesCommand wiring yet).

Tests:
  • Commons: ReadTagValuesCommand discovered by ManagementCommandRegistry.
  • DataConnectionLayer: unknown connection → ConnectionNotFound,
    not-connected adapter → ConnectionNotConnected (ReadBatchAsync NOT called),
    success-path mapping (Good/Bad + per-tag error), cancellation → Timeout.
  • CentralUI: register IBindingTester (and the previously-missing
    IOpcUaBrowseService) on the existing InstanceConfigureAuditDrillinTests
    Bunit container so the page renders cleanly with the new dialog.

src/ZB.MOM.WW.ScadaBridge.DataConnectionLayer/Actors/DataConnectionManagerActor.cs

@@ -47,6 +47,7 @@ public class DataConnectionManagerActor : ReceiveActor
         Receive<RemoveConnectionCommand>(HandleRemoveConnection);
         Receive<GetAllHealthReports>(HandleGetAllHealthReports);
         Receive<BrowseOpcUaNodeCommand>(HandleBrowse);
+        Receive<ReadTagValuesCommand>(HandleReadTagValues);
     }
 
     private void HandleCreateConnection(CreateConnectionCommand command)
@@ -140,6 +141,33 @@ public class DataConnectionManagerActor : ReceiveActor
         }
     }
 
+    /// <summary>
+    /// Routes a <see cref="ReadTagValuesCommand"/> from the CentralUI's Test
+    /// Bindings dialog to the child <see cref="DataConnectionActor"/> that
+    /// owns the named connection. Same split as <see cref="HandleBrowse"/> —
+    /// the manager owns
+    /// <see cref="ReadTagValuesFailureKind.ConnectionNotFound"/> because it is
+    /// the only actor with site-level visibility; every other failure
+    /// (not connected, server error, timeout) is resolved by the child where
+    /// the adapter is held.
+    /// </summary>
+    private void HandleReadTagValues(ReadTagValuesCommand command)
+    {
+        if (_connectionActors.TryGetValue(command.ConnectionName, out var actor))
+        {
+            actor.Forward(command);
+        }
+        else
+        {
+            _log.Warning("No connection actor for {0} during test-bindings read", command.ConnectionName);
+            Sender.Tell(new ReadTagValuesResult(
+                Array.Empty<TagReadOutcome>(),
+                new ReadTagValuesFailure(
+                    ReadTagValuesFailureKind.ConnectionNotFound,
+                    $"No data connection named '{command.ConnectionName}' at this site.")));
+        }
+    }
+
     private void HandleRemoveConnection(RemoveConnectionCommand command)
     {
         if (_connectionActors.TryGetValue(command.ConnectionName, out var actor))