chore(lint): unify formatting on golangci-lint fmt (gofumpt), uncap issue reporting, fix gofumpt drift

- make format 现在与 code-check 使用同一格式化器（golangci-lint fmt），消除 goimports -local 与 gofumpt 的格式拉锯
- .golangci.yml 关闭默认 50/3 截断，完整上报所有问题（只增强不弱化）
- 全库 gofumpt 规范化（203 files, 纯格式无行为变更）

backend/plugins/domain/admin/handlers_updater.go

@@ -4,6 +4,10 @@
 package admin
 
 import (
+	"Wavelet/pkg/buildinfo"
+	"Wavelet/pkg/logger"
+	"Wavelet/pkg/response"
+	"Wavelet/pkg/util"
 	"archive/tar"
 	"archive/zip"
 	"compress/gzip"
@@ -23,11 +27,6 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"golang.org/x/mod/semver"
-
-	"Wavelet/pkg/buildinfo"
-	"Wavelet/pkg/logger"
-	"Wavelet/pkg/response"
-	"Wavelet/pkg/util"
 )
 
 const (
@@ -391,7 +390,7 @@ func matchBinaryName(name string, candidates []string) bool {
 	return false
 }
 
-func getCandidateBinaryNames(executable string, repository string) []string {
+func getCandidateBinaryNames(executable, repository string) []string {
 	execName := filepath.Base(executable)
 	names := []string{execName}
 
@@ -435,7 +434,7 @@ func isLikelyBinary(name string, isDir bool, mode os.FileMode) bool {
 		return filepath.Ext(base) == ".exe"
 	}
 
-	return (mode.Perm()&0111 != 0) || (filepath.Ext(base) == "")
+	return (mode.Perm()&0o111 != 0) || (filepath.Ext(base) == "")
 }
 
 func findBinaryInTarGz(archivePath string, candidates []string) (string, error) {