feat(audit): M5.2 per-node stuck-count KPIs (T6) — repo per-node aggregation, actor message pair, CentralUI tiles

src/ZB.MOM.WW.ScadaBridge.Commons/Interfaces/Repositories/ISiteCallAuditRepository.cs

@@ -107,4 +107,19 @@ public interface ISiteCallAuditRepository
         DateTime stuckCutoff,
         DateTime intervalSince,
         CancellationToken ct = default);
+
+    /// <summary>
+    /// Computes a point-in-time <see cref="SiteCallNodeKpiSnapshot"/> per originating
+    /// node. Nodes with no <c>SiteCalls</c> rows at all are omitted; rows with a
+    /// <c>NULL</c> <c>SourceNode</c> are excluded. The stuck cutoff and interval
+    /// bounds are interpreted as in <see cref="ComputeKpisAsync"/>.
+    /// </summary>
+    /// <param name="stuckCutoff">UTC threshold for classifying a row as stuck.</param>
+    /// <param name="intervalSince">UTC start of the delivered/failed interval window.</param>
+    /// <param name="ct">Cancellation token.</param>
+    /// <returns>A task that resolves to a per-node KPI list; nodes with no rows are omitted.</returns>
+    Task<IReadOnlyList<SiteCallNodeKpiSnapshot>> ComputePerNodeKpisAsync(
+        DateTime stuckCutoff,
+        DateTime intervalSince,
+        CancellationToken ct = default);
 }