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.

tests/ZB.MOM.WW.ScadaBridge.Commons.Tests/Messages/ReadTagValuesCommandRegistryTests.cs

@@ -0,0 +1,24 @@
+using ZB.MOM.WW.ScadaBridge.Commons.Messages.Management;
+
+namespace ZB.MOM.WW.ScadaBridge.Commons.Tests.Messages;
+
+/// <summary>
+/// Verifies that <see cref="ReadTagValuesCommand"/> is discovered by
+/// <see cref="ManagementCommandRegistry"/> so it travels over the management
+/// boundary as a known command (resolvable by wire name and round-trippable
+/// through <c>GetCommandName</c> / <c>Resolve</c>). Mirrors
+/// <see cref="BrowseCommandsRegistryTests"/>.
+/// </summary>
+public class ReadTagValuesCommandRegistryTests
+{
+    [Fact]
+    public void Registry_discovers_ReadTagValuesCommand()
+    {
+        // GetCommandName throws ArgumentException for any type the registry
+        // does not contain, so a successful call here is proof of discovery.
+        var name = ManagementCommandRegistry.GetCommandName(typeof(ReadTagValuesCommand));
+
+        Assert.Equal("ReadTagValues", name);
+        Assert.Equal(typeof(ReadTagValuesCommand), ManagementCommandRegistry.Resolve(name));
+    }
+}