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

src/Core/ZB.MOM.WW.OtOpcUa.Commons/Messages/Redundancy/NodeRedundancyState.cs

@@ -0,0 +1,16 @@
+using ZB.MOM.WW.OtOpcUa.Commons.Types;
+
+namespace ZB.MOM.WW.OtOpcUa.Commons.Messages.Redundancy;
+
+public enum RedundancyRole { Primary, Secondary, Detached }
+
+/// <summary>
+/// Snapshot of a single node's redundancy state. Aggregated by <c>RedundancyStateActor</c>
+/// to compute fleet-wide ServiceLevel.
+/// </summary>
+public sealed record NodeRedundancyState(
+    NodeId NodeId,
+    RedundancyRole Role,
+    bool IsClusterLeader,
+    bool IsRoleLeaderForDriver,
+    DateTime AsOfUtc);

src/Core/ZB.MOM.WW.OtOpcUa.Commons/Messages/Redundancy/RedundancyStateChanged.cs

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+using ZB.MOM.WW.OtOpcUa.Commons.Types;
+
+namespace ZB.MOM.WW.OtOpcUa.Commons.Messages.Redundancy;
+
+/// <summary>
+/// Broadcast whenever the cluster's redundancy topology changes (node up/down, role-leader
+/// change, partition heal). Subscribers compute their local OPC UA ServiceLevel from this.
+/// </summary>
+public sealed record RedundancyStateChanged(
+    IReadOnlyList<NodeRedundancyState> Nodes,
+    CorrelationId CorrelationId);