Track Galaxy Platform and AppEngine runtime state via ScanState probes and proactively invalidate descendant variable quality on Stopped transitions so operators can detect a stopped runtime host before downstream clients read stale data and so the bridge delivers a uniform bad-quality signal instead of relying on MxAccess per-tag fan-out

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

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

@@ -23,7 +23,9 @@
     "MonitorIntervalSeconds": 5,
     "AutoReconnect": true,
     "ProbeTag": null,
-    "ProbeStaleThresholdSeconds": 60
+    "ProbeStaleThresholdSeconds": 60,
+    "RuntimeStatusProbesEnabled": true,
+    "RuntimeStatusUnknownTimeoutSeconds": 15
   },
   "GalaxyRepository": {
     "ConnectionString": "Server=localhost;Database=ZB;Integrated Security=true;",