Add configurable non-transparent OPC UA server redundancy

Separates ApplicationUri from namespace identity so each instance in a
redundant pair has a unique server URI while sharing the same Galaxy
namespace. Exposes RedundancySupport, ServerUriArray, and dynamic
ServiceLevel through the standard OPC UA server object. ServiceLevel
is computed from role (Primary/Secondary) and runtime health (MXAccess
and DB connectivity). Adds CLI redundancy command, second deployed
service instance, and 31 new tests including paired-server integration.

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

src/ZB.MOM.WW.LmxOpcUa.Host/appsettings.json

@@ -7,7 +7,8 @@
     "GalaxyName": "ZB",
     "MaxSessions": 100,
     "SessionTimeoutMinutes": 30,
-    "AlarmTrackingEnabled": false
+    "AlarmTrackingEnabled": false,
+    "ApplicationUri": null
   },
   "MxAccess": {
     "ClientName": "LmxOpcUa",
@@ -45,6 +46,13 @@
     "PkiRootPath": null,
     "CertificateSubject": null
   },
+  "Redundancy": {
+    "Enabled": false,
+    "Mode": "Warm",
+    "Role": "Primary",
+    "ServerUris": [],
+    "ServiceLevelBase": 200
+  },
   "Historian": {
     "Enabled": false,
     "ConnectionString": "Server=localhost;Database=Runtime;Integrated Security=true;",