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/sftp/service.go

@@ -844,9 +844,9 @@ func (s *Service) GetSystemInfo(connID string) (map[string]interface{}, error) {
 		out, e := c.RunCommand(cmd)
 		results <- cmdResult{key, out, e}
 	}
-	go runCmd("df", "df -B1 / 2>/dev/null | tail -1")
-	go runCmd("mem", "free -b 2>/dev/null | grep -E '^Mem:' || cat /proc/meminfo 2>/dev/null | head -2")
-	go runCmd("cpu", "top -bn1 | grep 'Cpu(s)' | awk '{print $2}' | cut -d'%' -f1")
+	common.Go("sftp-cmd-df", func() { runCmd("df", "df -B1 / 2>/dev/null | tail -1") })
+	common.Go("sftp-cmd-mem", func() { runCmd("mem", "free -b 2>/dev/null | grep -E '^Mem:' || cat /proc/meminfo 2>/dev/null | head -2") })
+	common.Go("sftp-cmd-cpu", func() { runCmd("cpu", "top -bn1 | grep 'Cpu(s)' | awk '{print $2}' | cut -d'%' -f1") })
 
 	var dfOut, memOut, cpuOut string
 	hasErr := false