feat(auditlog): GetExecutionTreeAsync recursive execution-chain query

tests/ScadaLink.IntegrationTests/AuditLog/SiteAuditPushFlowTests.cs

@@ -96,6 +96,10 @@ public class SiteAuditPushFlowTests : TestKit
         public Task<AuditLogKpiSnapshot> GetKpiSnapshotAsync(
             TimeSpan window, DateTime? nowUtc = null, CancellationToken ct = default)
             => throw new NotSupportedException();
+
+        public Task<IReadOnlyList<ExecutionTreeNode>> GetExecutionTreeAsync(
+            Guid executionId, CancellationToken ct = default)
+            => throw new NotSupportedException();
     }
 
     private static AuditEvent NewPendingEvent(Guid id) => new()