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/Actors/StreamRelayActor.cs

@@ -84,7 +84,9 @@ public class StreamRelayActor : ReceiveActor
                     ? Timestamp.FromDateTimeOffset(msg.OriginalRaiseTime.Value)
                     : null,
                 CurrentValue = msg.CurrentValue ?? string.Empty,
-                LimitValue = msg.LimitValue ?? string.Empty
+                LimitValue = msg.LimitValue ?? string.Empty,
+                NativeSourceCanonicalName = msg.NativeSourceCanonicalName ?? string.Empty,
+                IsConfiguredPlaceholder = msg.IsConfiguredPlaceholder
             }
         };