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/appsettings.json

@@ -0,0 +1,32 @@
+{
+  "OpcUa": {
+    "Port": 4840,
+    "EndpointPath": "/LmxOpcUa",
+    "ServerName": "LmxOpcUa",
+    "GalaxyName": "ZB",
+    "MaxSessions": 100,
+    "SessionTimeoutMinutes": 30
+  },
+  "MxAccess": {
+    "ClientName": "LmxOpcUa",
+    "NodeName": null,
+    "GalaxyName": null,
+    "ReadTimeoutSeconds": 5,
+    "WriteTimeoutSeconds": 5,
+    "MaxConcurrentOperations": 10,
+    "MonitorIntervalSeconds": 5,
+    "AutoReconnect": true,
+    "ProbeTag": null,
+    "ProbeStaleThresholdSeconds": 60
+  },
+  "GalaxyRepository": {
+    "ConnectionString": "Server=localhost;Database=ZB;Integrated Security=true;",
+    "ChangeDetectionIntervalSeconds": 30,
+    "CommandTimeoutSeconds": 30
+  },
+  "Dashboard": {
+    "Enabled": true,
+    "Port": 8081,
+    "RefreshIntervalSeconds": 10
+  }
+}