perfsprint 18→0：strconv.Itoa/FormatInt/FormatUint/FormatBool 替代 fmt.Sprintf、无动词 fmt.Errorf→errors.New、纯字符串拼接。全部语义等价（已核对 diff）。修正 fixer 遗留的 import 问题（引入 goimports 统一整理）。

Result: {"status":"keep","total_issues":56,"golint_canonicalheader":8,"golint_errname":1,"golint_errorlint":12,"golint_forcetypeassert":3,"golint_gosec":0,"golint_intrange":3,"golint_modernize":5,"golint_nilnil":3,"golint_perfsprint":0,"golint_prealloc":3,"golint_recvcheck":7,"golint_usestdlibvars":3,"golint_wastedassign":7,"golint_total":55,"eslint_problems":1,"eslint_errors":0,"eslint_warnings":1,"tsc_errors":0,"measure_s":47}

internal/apps/openflare/uptimekuma/sync.go

@@ -5,6 +5,7 @@ package uptimekuma
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"log/slog"
 	"strings"
@@ -75,11 +76,11 @@ func SyncToUptimeKuma(ctx context.Context) error {
 	// 检查是否启用
 	enabled, _ := repository.GetBoolByKey(ctx, model.ConfigKeyUptimeKumaEnabled)
 	if !enabled {
-		return fmt.Errorf("uptime Kuma integration is disabled")
+		return errors.New("uptime Kuma integration is disabled")
 	}
 
 	if !isSyncing.CompareAndSwap(false, true) {
-		return fmt.Errorf("sync task is already in progress, please try again later")
+		return errors.New("sync task is already in progress, please try again later")
 	}
 	defer isSyncing.Store(false)
 
@@ -225,7 +226,7 @@ func filterOpenFlareMonitors(monitors map[string]Monitor, openFlareTagID int) ma
 
 func routeMonitorURL(ctx context.Context, route *model.ProxyRoute) (string, error) {
 	if route == nil {
-		return "", fmt.Errorf("proxy route is nil")
+		return "", errors.New("proxy route is nil")
 	}
 	domains, err := repository.ListZoneDomainsByRouteID(ctx, route.ID)
 	if err != nil {