fix: calculate current price for non-WorstOf end labels from series data

PriceWorst is only populated by the SP for the WorstOf underlying.
For others, derive current price as (last Performance% / 100) * Strike.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

CertReports.Syncfusion/Services/Implementations/SkiaChartRendererV2.cs

@@ -154,7 +154,8 @@ public static class SkiaChartRendererV2
                 color = OtherUlColors[otherColorIdx++ % OtherUlColors.Length];
                 thickness = 1f;
                 seriesLabel = ul.Sottostante;
-                endLabel = $"{ul.Sottostante} ({ul.PriceWorst:0.00})";
+                decimal currentPrice = ulPoints.Last().Performance / 100m * ul.Strike;
+                endLabel = $"{ul.Sottostante} ({currentPrice:0.00})";
             }
 
             DrawSeriesV2(canvas, plotArea, ulPoints, minDate, maxDate, minY, maxY, color, thickness);