Add cross-platform OPC UA client stack: shared library, CLI tool, and Avalonia UI

Implements Client.Shared (IOpcUaClientService with connection lifecycle, failover,
browse, read/write, subscriptions, alarms, history, redundancy), Client.CLI (8 CliFx
commands mirroring tools/opcuacli-dotnet), and Client.UI (Avalonia desktop app with
tree browser, read/write, subscriptions, alarms, and history tabs). All three target
.NET 10 and are covered by 249 unit tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ZB.MOM.WW.LmxOpcUa.Client.Shared/Adapters/DefaultSessionFactory.cs

@@ -0,0 +1,37 @@
+using Opc.Ua;
+using Opc.Ua.Client;
+using Serilog;
+
+namespace ZB.MOM.WW.LmxOpcUa.Client.Shared.Adapters;
+
+/// <summary>
+/// Production session factory that creates real OPC UA sessions.
+/// </summary>
+internal sealed class DefaultSessionFactory : ISessionFactory
+{
+    private static readonly ILogger Logger = Log.ForContext<DefaultSessionFactory>();
+
+    public async Task<ISessionAdapter> CreateSessionAsync(
+        ApplicationConfiguration config,
+        EndpointDescription endpoint,
+        string sessionName,
+        uint sessionTimeoutMs,
+        UserIdentity identity,
+        CancellationToken ct)
+    {
+        var endpointConfig = EndpointConfiguration.Create(config);
+        var configuredEndpoint = new ConfiguredEndpoint(null, endpoint, endpointConfig);
+
+        var session = await Session.Create(
+            config,
+            configuredEndpoint,
+            false,
+            sessionName,
+            sessionTimeoutMs,
+            identity,
+            null);
+
+        Logger.Information("Session created: {SessionName} -> {EndpointUrl}", sessionName, endpoint.EndpointUrl);
+        return new DefaultSessionAdapter(session);
+    }
+}