feat(debugview): DV-1 native-binding linkage on AlarmStateChanged contract chain

Add two additive init-only fields to AlarmStateChanged so the Debug View can
nest live native conditions under their configured source-binding node:
  - NativeSourceCanonicalName (binding canonical name, e.g. "Motor1.MotorAlarms")
  - IsConfiguredPlaceholder (quiet-binding placeholder flag; default false)

Flow on BOTH cross-process paths:
  - Live: proto AlarmStateUpdate fields 22/23 -> StreamRelayActor packs ->
    SiteStreamGrpcClient unpacks (regenerated SiteStreamGrpc/Sitestream.cs).
  - Snapshot (Newtonsoft): record defaults carry through; no special handling.

NativeAlarmActor.Emit now stamps NativeSourceCanonicalName = _source.CanonicalName.
Additive-only: no existing positional constructor or wire frame changed.

Tests: StreamRelayActorTests round-trips both fields pack->unpack;
NativeAlarmActorTests asserts the emitted event carries the binding canonical name.

src/ZB.MOM.WW.ScadaBridge.Communication/Grpc/SiteStreamGrpcClient.cs

@@ -253,7 +253,9 @@ public class SiteStreamGrpcClient : IAsyncDisposable, IDisposable
             OperatorComment = evt.AlarmChanged.OperatorComment ?? string.Empty,
             OriginalRaiseTime = evt.AlarmChanged.OriginalRaiseTime?.ToDateTimeOffset(),
             CurrentValue = evt.AlarmChanged.CurrentValue ?? string.Empty,
-            LimitValue = evt.AlarmChanged.LimitValue ?? string.Empty
+            LimitValue = evt.AlarmChanged.LimitValue ?? string.Empty,
+            NativeSourceCanonicalName = evt.AlarmChanged.NativeSourceCanonicalName ?? string.Empty,
+            IsConfiguredPlaceholder = evt.AlarmChanged.IsConfiguredPlaceholder
         },
         _ => null
     };