feat(centralui+comm): IOpcUaBrowseService + typed BrowseOpcUaNodeAsync on CommunicationService

src/ZB.MOM.WW.ScadaBridge.Communication/CommunicationService.cs

@@ -9,6 +9,7 @@ using ZB.MOM.WW.ScadaBridge.Commons.Messages.Health;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.InboundApi;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.Integration;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.Lifecycle;
+using ZB.MOM.WW.ScadaBridge.Commons.Messages.Management;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.Notification;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.RemoteQuery;
 using ZB.MOM.WW.ScadaBridge.Communication.Actors;
@@ -346,6 +347,29 @@ public class CommunicationService
             envelope, _options.QueryTimeout, cancellationToken);
     }
 
+    // ── OPC UA Tag Browser (interactive design-time query) ──
+
+    /// <summary>
+    /// Asks a site to enumerate the immediate children of an OPC UA node on the
+    /// live server backing the given data connection. Used by the CentralUI OPC UA
+    /// Tag Browser dialog. The Ask is bounded by <see cref="CommunicationOptions.QueryTimeout"/>
+    /// — interactive browse expansions are short, one-shot queries that share the
+    /// same latency budget as other remote queries (event logs, parked messages).
+    /// </summary>
+    /// <param name="siteId">The target site identifier.</param>
+    /// <param name="command">The OPC UA browse command.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The browse result (children + truncation flag + structured failure).</returns>
+    public Task<BrowseOpcUaNodeResult> BrowseOpcUaNodeAsync(
+        string siteId,
+        BrowseOpcUaNodeCommand command,
+        CancellationToken cancellationToken = default)
+    {
+        var envelope = new SiteEnvelope(siteId, command);
+        return GetActor().Ask<BrowseOpcUaNodeResult>(
+            envelope, _options.QueryTimeout, cancellationToken);
+    }
+
     // ── Pattern 8: Heartbeat (site→central, Tell) ──
     // Heartbeats are received by central, not sent. No method needed here.