修复: 粘贴图失效与SFTP串台回退等一批问题

粘贴图根修(Ctrl+V直读系统剪贴板,不再依赖不可靠的paste事件)/SFTP串台双刀(拨号期禁回退本机+盘符路径自动回根)/PDF导出目录设置与文案带落盘路径/性能批(连接保存下载防重/md渲染防抖+预热/hljs按需加载/审计锁外置/快捷方式解析超时/webview-watch可停)/前端62类型错清零(含keyPath蛇形字段炸弹)/目录图标字段错位修复

internal/api/update_api.go

@@ -5,6 +5,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"u-desk/internal/common"
 	"u-desk/internal/service"
 )
 
@@ -133,7 +134,7 @@ func (api *UpdateAPI) DownloadUpdate(downloadURL string) (map[string]interface{}
 		return errorResponse("已有下载任务进行中"), nil
 	}
 
-	go func() {
+	common.Go("download-update", func() {
 		defer api.downloading.Store(false)
 
 		progressCallback := func(progress float64, speed float64, downloaded int64, total int64) {
@@ -162,7 +163,7 @@ func (api *UpdateAPI) DownloadUpdate(downloadURL string) (map[string]interface{}
 			}
 			api.emit("download-complete", resultInfo)
 		}
-	}()
+	})
 
 	return successResponse(map[string]interface{}{
 		"message": "下载已开始",