fix(comm+site): route BrowseOpcUaNodeCommand via DeploymentManagerActor singleton

src/ZB.MOM.WW.ScadaBridge.Communication/Actors/SiteCommunicationActor.cs

@@ -146,22 +146,13 @@ public class SiteCommunicationActor : ReceiveActor, IWithTimers
         Receive<RouteToSetAttributesRequest>(msg => _deploymentManagerProxy.Forward(msg));
 
         // OPC UA Tag Browser (interactive design-time query) — forward to the
-        // site-local Data Connection Manager actor, which owns the in-memory
+        // Deployment Manager singleton, which always lands on the active site
-        // map of live data-connection adapters keyed by ConnectionName and
+        // node. Routing to the site-local /user/dcl-manager directly is wrong
-        // executes the browse against the appropriate OPC UA client. The
+        // because the standby node has a dcl-manager too, but its
-        // manager is not a child of DeploymentManagerActor, so we route via
+        // DataConnectionActor children (which own the live OPC UA sessions)
-        // ActorSelection rather than the _deploymentManagerProxy field; the
+        // only exist on the singleton's node. The singleton then re-forwards
-        // path matches the registration in AkkaHostedService. ActorSelection
+        // to its own /user/dcl-manager, which DOES have the connection.
-        // has no Forward() helper, so we Tell with the original Sender so the
+        Receive<BrowseOpcUaNodeCommand>(msg => _deploymentManagerProxy.Forward(msg));
-        // BrowseOpcUaNodeResult routes straight back to the central UI's Ask
-        // (via the CentralCommunicationActor sender chain), not to us.
-        Receive<BrowseOpcUaNodeCommand>(msg =>
-        {
-            _log.Debug(
-                "Routing BrowseOpcUaNodeCommand for connection '{0}' to DataConnectionManager",
-                msg.ConnectionName);
-            Context.ActorSelection("/user/dcl-manager").Tell(msg, Sender);
-        });
 
         // Pattern 7: Remote Queries
         Receive<EventLogQueryRequest>(msg =>

src/ZB.MOM.WW.ScadaBridge.SiteRuntime/Actors/DeploymentManagerActor.cs

@@ -6,6 +6,7 @@ using ZB.MOM.WW.ScadaBridge.Commons.Messages.Deployment;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.InboundApi;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.Instance;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.Lifecycle;
+using ZB.MOM.WW.ScadaBridge.Commons.Messages.Management;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.ScriptExecution;
 using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
 using ZB.MOM.WW.ScadaBridge.HealthMonitoring;
@@ -147,6 +148,15 @@ public class DeploymentManagerActor : ReceiveActor, IWithTimers
         Receive<RouteToGetAttributesRequest>(RouteInboundApiGetAttributes);
         Receive<RouteToSetAttributesRequest>(RouteInboundApiSetAttributes);
 
+        // OPC UA Tag Browser — singleton-only re-forward to local /user/dcl-manager.
+        // BrowseOpcUaNodeCommand is routed to this singleton (active node) by
+        // SiteCommunicationActor so the dcl-manager we forward to is guaranteed
+        // to be the one holding the live DataConnectionActor children. ActorSelection
+        // has no Forward() extension in this Akka.NET version, so we Tell with the
+        // original Sender preserved (semantically identical to Forward).
+        Receive<BrowseOpcUaNodeCommand>(msg =>
+            Context.ActorSelection("/user/dcl-manager").Tell(msg, Sender));
+
         // Internal startup messages
         Receive<StartupConfigsLoaded>(HandleStartupConfigsLoaded);
         Receive<SharedScriptsLoaded>(HandleSharedScriptsLoaded);