Implement LmxOpcUa server — all 6 phases complete

Full OPC UA server on .NET Framework 4.8 (x86) exposing AVEVA System
Platform Galaxy tags via MXAccess. Mirrors Galaxy object hierarchy as
OPC UA address space, translating contained-name browse paths to
tag-name runtime references.

Components implemented:
- Configuration: AppConfiguration with 4 sections, validator
- Domain: ConnectionState, Quality, Vtq, MxDataTypeMapper, error codes
- MxAccess: StaComThread, MxAccessClient (partial classes), MxProxyAdapter
  using strongly-typed ArchestrA.MxAccess COM interop
- Galaxy Repository: SQL queries (hierarchy, attributes, change detection),
  ChangeDetectionService with auto-rebuild on deploy
- OPC UA Server: LmxNodeManager (CustomNodeManager2), LmxOpcUaServer,
  OpcUaServerHost with programmatic config, SecurityPolicy None
- Status Dashboard: HTTP server with HTML/JSON/health endpoints
- Integration: Full 14-step startup, graceful shutdown, component wiring

175 tests (174 unit + 1 integration), all passing.

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

src/ZB.MOM.WW.LmxOpcUa.Host/OpcUa/LmxOpcUaServer.cs

@@ -0,0 +1,59 @@
+using System.Collections.Generic;
+using Opc.Ua;
+using Opc.Ua.Server;
+using ZB.MOM.WW.LmxOpcUa.Host.Domain;
+using ZB.MOM.WW.LmxOpcUa.Host.Metrics;
+
+namespace ZB.MOM.WW.LmxOpcUa.Host.OpcUa
+{
+    /// <summary>
+    /// Custom OPC UA server that creates the LmxNodeManager. (OPC-001, OPC-012)
+    /// </summary>
+    public class LmxOpcUaServer : StandardServer
+    {
+        private readonly string _galaxyName;
+        private readonly IMxAccessClient _mxAccessClient;
+        private readonly PerformanceMetrics _metrics;
+        private LmxNodeManager? _nodeManager;
+
+        public LmxNodeManager? NodeManager => _nodeManager;
+        public int ActiveSessionCount
+        {
+            get
+            {
+                try { return ServerInternal?.SessionManager?.GetSessions()?.Count ?? 0; }
+                catch { return 0; }
+            }
+        }
+
+        public LmxOpcUaServer(string galaxyName, IMxAccessClient mxAccessClient, PerformanceMetrics metrics)
+        {
+            _galaxyName = galaxyName;
+            _mxAccessClient = mxAccessClient;
+            _metrics = metrics;
+        }
+
+        protected override MasterNodeManager CreateMasterNodeManager(IServerInternal server, ApplicationConfiguration configuration)
+        {
+            var namespaceUri = $"urn:{_galaxyName}:LmxOpcUa";
+            _nodeManager = new LmxNodeManager(server, configuration, namespaceUri, _mxAccessClient, _metrics);
+
+            var nodeManagers = new List<INodeManager> { _nodeManager };
+            return new MasterNodeManager(server, configuration, null, nodeManagers.ToArray());
+        }
+
+        protected override ServerProperties LoadServerProperties()
+        {
+            var properties = new ServerProperties
+            {
+                ManufacturerName = "ZB MOM",
+                ProductName = "LmxOpcUa Server",
+                ProductUri = $"urn:{_galaxyName}:LmxOpcUa",
+                SoftwareVersion = GetType().Assembly.GetName().Version?.ToString() ?? "1.0.0",
+                BuildNumber = "1",
+                BuildDate = System.DateTime.UtcNow
+            };
+            return properties;
+        }
+    }
+}