fix(frontend): update ModelInfoResponse types to match backend structure

- Update TypeScript types to match flat backend response structure
- Remove nested model_info and metrics objects
- Remove label_config, use labels array and per_class_metrics array
- Update all component references to use new structure
- Generate default colors for prediction labels in CandleChart
- Fix TypeScript type errors for nullable model_version
- Remove accuracy/F1 metrics display (not in new response)

src/components/CandleChart.tsx

@@ -374,10 +374,21 @@ const CandleChart = forwardRef<CandleChartHandle, CandleChartProps>(
       }
 
       // Build a label-to-color map from modelInfo
+      // Generate colors for labels since backend no longer provides them
       const labelColorMap: Record<string, string> = {};
-      if (modelInfo?.label_config) {
-        modelInfo.label_config.forEach((lc) => {
-          labelColorMap[lc.name] = lc.color;
+      if (modelInfo?.labels) {
+        const predefinedColors = [
+          '#3b82f6', // blue
+          '#ef4444', // red
+          '#10b981', // green
+          '#f59e0b', // amber
+          '#8b5cf6', // violet
+          '#ec4899', // pink
+          '#06b6d4', // cyan
+          '#f97316', // orange
+        ];
+        modelInfo.labels.forEach((label, index) => {
+          labelColorMap[label] = predefinedColors[index % predefinedColors.length];
         });
       }