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/node/logics.go

@@ -414,14 +414,14 @@ type forceSyncConfigPayload struct {
 func ValidateDiscoveryToken(ctx context.Context, token string) error {
 	token = strings.TrimSpace(token)
 	if token == "" {
-		return fmt.Errorf("缺少 Discovery Token")
+		return errors.New("缺少 Discovery Token")
 	}
 	discoveryToken, err := ensureGlobalDiscoveryToken(ctx)
 	if err != nil {
 		return err
 	}
 	if token != discoveryToken {
-		return fmt.Errorf("discovery Token 无效") // error 消息首字母小写
+		return errors.New("discovery Token 无效") // error 消息首字母小写
 	}
 	return nil
 }