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/edge/updater/restart_unix.go

@@ -4,6 +4,7 @@
 package updater
 
 import (
+	"errors"
 	"fmt"
 	"log/slog"
 	"os"
@@ -37,7 +38,7 @@ func replaceAndRestart(execPath string, tmpPath string) error {
 	if err := syscall.Exec(execPath, os.Args, os.Environ()); err != nil { //nolint:gosec // execPath is the validated edge updater binary path
 		return fmt.Errorf("exec restart: %w", err)
 	}
-	return fmt.Errorf("unreachable after exec")
+	return errors.New("unreachable after exec")
 }
 
 func removeBackupBinary(path string) error {

internal/apps/edge/updater/service.go

@@ -6,6 +6,7 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"log/slog"
@@ -295,7 +296,7 @@ func parseSHA256Checksum(content string, assetName string) (string, error) {
 		}
 	}
 	if assetName == "" {
-		return "", fmt.Errorf("checksum asset does not contain a valid sha256 digest")
+		return "", errors.New("checksum asset does not contain a valid sha256 digest")
 	}
 	return "", fmt.Errorf("checksum asset does not contain a sha256 digest for %q", assetName)
 }
@@ -340,7 +341,7 @@ func isSHA256Hex(value string) bool {
 func (s *Service) downloadAndRestart(ctx context.Context, url string, expectedChecksum string, targetPath string) error {
 	expectedChecksum = strings.ToLower(strings.TrimSpace(expectedChecksum))
 	if !isSHA256Hex(expectedChecksum) {
-		return fmt.Errorf("invalid expected sha256 checksum")
+		return errors.New("invalid expected sha256 checksum")
 	}
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
 	if err != nil {