feat(commons): add deploy/admin/audit/redundancy/fleet message contracts

src/Core/ZB.MOM.WW.OtOpcUa.Commons/Messages/Audit/AuditEvent.cs

@@ -0,0 +1,17 @@
+using ZB.MOM.WW.OtOpcUa.Commons.Types;
+
+namespace ZB.MOM.WW.OtOpcUa.Commons.Messages.Audit;
+
+/// <summary>
+/// Cluster-broadcast audit event consumed by the <c>AuditWriterActor</c> singleton, which
+/// batches and idempotently inserts into <c>ConfigAuditLog</c>.
+/// </summary>
+public sealed record AuditEvent(
+    Guid EventId,
+    string Category,
+    string Action,
+    string Actor,
+    DateTime OccurredAtUtc,
+    string? DetailsJson,
+    NodeId SourceNode,
+    CorrelationId CorrelationId);