feat(performance): update performance metrics handling and UI components

pkg/perf_metrics/metrics.go

@@ -187,7 +187,7 @@ func QuerySummaryAll(hours int) (SummaryAllResult, error) {
 		})
 	}
 	sort.Slice(models, func(i, j int) bool {
-		return models[i].ModelName < models[j].ModelName
+		return models[i].RequestCount > models[j].RequestCount
 	})
 
 	return SummaryAllResult{Models: models}, nil

pkg/perf_metrics/types.go

@@ -52,7 +52,7 @@ type ModelSummary struct {
 	AvgLatencyMs int64   `json:"avg_latency_ms"`
 	SuccessRate  float64 `json:"success_rate"`
 	AvgTps       float64 `json:"avg_tps"`
-	RequestCount int64   `json:"request_count"`
+	RequestCount int64   `json:"-"`
 }
 
 type SummaryAllResult struct {