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/waf/graph_validate.go

@@ -68,7 +68,7 @@ func validateRuleGraphLimits(graph RuleGraph) error {
 	if raw, err := json.Marshal(graph); err != nil {
 		return fmt.Errorf("规则图无法序列化: %w", err)
 	} else if len(raw) > maxRuleGraphBytes {
-		return fmt.Errorf("规则图大小不能超过 256 KiB")
+		return errors.New("规则图大小不能超过 256 KiB")
 	}
 	return nil
 }