fix(kpi): query service applies catalog aggregation at the bucketer — rate charts keep one unit across the raw/rollup boundary (plan R2-04 T6)

src/ZB.MOM.WW.ScadaBridge.CentralUI/Services/KpiHistoryQueryService.cs

@@ -76,12 +76,18 @@ public sealed class KpiHistoryQueryService : IKpiHistoryQueryService
     {
         var effectiveMax = maxPoints ?? _options.DefaultMaxSeriesPoints;
 
+        // Per-metric reduction intent: the same catalog that drives the hourly fold drives
+        // the chart-time bucket reduction, so a Rate series is summed per bucket on BOTH the
+        // raw-minute and hourly-rollup routes — one unit ("events per chart bucket") on both
+        // sides of the RollupThresholdHours routing boundary (arch-review 04 round 2, R3).
+        var aggregation = KpiMetricAggregationCatalog.Resolve(source, metric);
+
         // Test-seam ctor: use the injected repository directly.
         if (_injectedRepository is not null)
         {
             var injectedSeries = await FetchSeriesAsync(
                 _injectedRepository, source, metric, scope, scopeKey, fromUtc, toUtc, cancellationToken);
-            return KpiSeriesBucketer.Bucket(injectedSeries, fromUtc, toUtc, effectiveMax);
+            return KpiSeriesBucketer.Bucket(injectedSeries, fromUtc, toUtc, effectiveMax, aggregation);
         }
 
         // Production: a fresh scope (and thus a fresh DbContext) per query so a
@@ -90,7 +96,7 @@ public sealed class KpiHistoryQueryService : IKpiHistoryQueryService
         var repository = serviceScope.ServiceProvider.GetRequiredService<IKpiHistoryRepository>();
         var series = await FetchSeriesAsync(
             repository, source, metric, scope, scopeKey, fromUtc, toUtc, cancellationToken);
-        return KpiSeriesBucketer.Bucket(series, fromUtc, toUtc, effectiveMax);
+        return KpiSeriesBucketer.Bucket(series, fromUtc, toUtc, effectiveMax, aggregation);
     }
 
     /// <summary>
@@ -103,6 +109,13 @@ public sealed class KpiHistoryQueryService : IKpiHistoryQueryService
     /// the caller's <see cref="KpiSeriesBucketer.Bucket"/> step is agnostic to the source
     /// (a 90 d rollup can still exceed the point ceiling, so bucketing still applies).
     /// The boundary is strict: exactly <c>RollupThresholdHours</c> stays on the raw path.
+    /// <para>
+    /// The routing boundary no longer changes a Rate chart's magnitude: both paths reduce to
+    /// per-bucket sums via the catalog-driven aggregation applied in
+    /// <see cref="GetSeriesAsync"/>. A residual ≤~1.2× native-resolution difference exists only
+    /// for an unbucketed just-over-threshold rollup series (plotted at native per-hour sums) vs.
+    /// an at-threshold bucketed raw series — documented, not hidden (arch-review 04 round 2, R3).
+    /// </para>
     /// </summary>
     private Task<IReadOnlyList<KpiSeriesPoint>> FetchSeriesAsync(
         IKpiHistoryRepository repository,