fix(ui): показывать реальный источник и ошибки DNS

app/(main)/probes/page.tsx

@@ -72,7 +72,7 @@ const TOOL_META: Record<DiagTool, {
   ping:       { label: "Ping",        ros: "/tool ping",           Icon: ActivityIcon, color: "text-sky-500",     description: "Проверка связи и RTT" },
   traceroute: { label: "Traceroute",  ros: "/tool traceroute",     Icon: RouteIcon,    color: "text-violet-500",  description: "Трассировка маршрута" },
   bandwidth:  { label: "BW-тест",    ros: "/tool bandwidth-test", Icon: ZapIcon,      color: "text-emerald-500", description: "Пропускная способность" },
-  dns:        { label: "DNS",         ros: "/resolve",             Icon: SearchIcon,   color: "text-amber-500",   description: "Разрешение DNS-имён" },
+  dns:        { label: "DNS",         ros: "DNS приложения",             Icon: SearchIcon,   color: "text-amber-500",   description: "DNS на хосте приложения" },
   route:      { label: "Маршрут",    ros: "/ip route lookup",     Icon: NetworkIcon,  color: "text-blue-500",    description: "Поиск активного маршрута" },
   mtu:        { label: "MTU-тест",   ros: "/tool ping",           Icon: RulerIcon,    color: "text-orange-500",  description: "Определение MTU пути" },
 }
@@ -312,7 +312,7 @@ function buildCommand(
     case "bandwidth":
       return `/tool bandwidth-test address=${opts.bwTarget ?? target} duration=${opts.bwDuration ?? 10}s protocol=${opts.bwProto ?? "tcp"} direction=both`
     case "dns":
-      return `/resolve ${target} type=${opts.dnsType ?? "A"} server=1.1.1.1`
+      return "DNS приложения: " + target + " · " + (opts.dnsType ?? "A") + " · резолвер хоста backend"
     case "route":
       return `/ip route lookup ip=${target}`
     case "mtu":
@@ -1116,7 +1116,7 @@ function ProbesContent() {
               {/* RouterOS command preview */}
               <div className="flex items-center gap-2 rounded-lg bg-zinc-950 dark:bg-zinc-900 px-3 py-2 border border-zinc-800">
                 <TerminalIcon className="size-3 text-zinc-500 shrink-0" />
-                <span className="text-zinc-500 text-xs font-mono shrink-0">[{srcServer?.name}]</span>
+                <span className="text-zinc-500 text-xs font-mono shrink-0">[{tool === "dns" ? (isLive ? "backend" : "демо") : srcServer?.name}]</span>
                 <span className="text-emerald-400 text-xs font-mono shrink-0">$</span>
                 <span className="text-zinc-300 text-xs font-mono truncate">{cmdPreview}</span>
                 <button onClick={() => navigator.clipboard.writeText(cmdPreview)}