fix: follow live request results and prioritize usable groups

pkg/perf_metrics/metrics.go

@@ -38,8 +38,8 @@ func RecordRelayResult(ctx context.Context, info *relaycommon.RelayInfo, apiErr
 		return
 	}
 	now := time.Now()
-	if outcome == OutcomeSuccess && !info.IsChannelTest && info.TokenId > 0 {
-		recordUserSuccess(info.UsingGroup, now.Unix())
+	if !info.IsChannelTest && info.TokenId > 0 {
+		recordUserResult(info.UsingGroup, UserRequestResult{At: now.UnixMilli(), Success: outcome == OutcomeSuccess})
 	}
 	hasTtft := info.IsStream && info.HasSendResponse()
 	ttftMs := int64(0)