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}

pkg/util/value.go

@@ -1,6 +1,9 @@
 package util
 
-import "fmt"
+import (
+	"fmt"
+	"strconv"
+)
 
 // Interface2String converts a string, int, or float64 value to its string representation.
 func Interface2String(inter any) string {
@@ -8,7 +11,7 @@ func Interface2String(inter any) string {
 	case string:
 		return v
 	case int:
-		return fmt.Sprintf("%d", v)
+		return strconv.Itoa(v)
 	case float64:
 		return fmt.Sprintf("%f", v)
 	}