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/ISessionFactory.cs

@@ -0,0 +1,27 @@
+using Opc.Ua;
+
+namespace ZB.MOM.WW.LmxOpcUa.Client.Shared.Adapters;
+
+/// <summary>
+/// Creates OPC UA sessions from a configured endpoint.
+/// </summary>
+internal interface ISessionFactory
+{
+    /// <summary>
+    /// Creates a session to the given endpoint.
+    /// </summary>
+    /// <param name="config">The application configuration.</param>
+    /// <param name="endpoint">The configured endpoint.</param>
+    /// <param name="sessionName">The session name.</param>
+    /// <param name="sessionTimeoutMs">Session timeout in milliseconds.</param>
+    /// <param name="identity">The user identity.</param>
+    /// <param name="ct">Cancellation token.</param>
+    /// <returns>A session adapter wrapping the created session.</returns>
+    Task<ISessionAdapter> CreateSessionAsync(
+        ApplicationConfiguration config,
+        EndpointDescription endpoint,
+        string sessionName,
+        uint sessionTimeoutMs,
+        UserIdentity identity,
+        CancellationToken ct = default);
+}