chore(dev): stop.bat 仅 ASCII，避免 Windows GBK 乱码断行

cmd 按 ANSI 解析 .bat，中文提示改由带 BOM 的 stop.ps1 输出。

Co-authored-by: Cursor <cursoragent@cursor.com>

stop.ps1

@@ -1,11 +1,15 @@
-# 按 Listen 端口终止进程树（含子进程）。默认 :3000 前端 / :3001 后端。
-# 由 stop.bat 调用；也可直接：powershell -File stop.ps1
+# Kill process trees listening on given ports. Default: :3000 frontend / :3001 backend.
+# Called by stop.bat; or: powershell -File stop.ps1
 
 param(
   [int[]]$Ports = @(3000, 3001)
 )
 
 $ErrorActionPreference = 'SilentlyContinue'
+[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
+
+Write-Host "Stopping listeners on :3000 / :3001 (process trees)..."
+Write-Host ""
 
 foreach ($port in $Ports) {
   $pids = @(
@@ -13,12 +17,15 @@ foreach ($port in $Ports) {
       Select-Object -ExpandProperty OwningProcess -Unique
   )
   if (-not $pids -or $pids.Count -eq 0) {
-    Write-Host "  :$port 空闲"
+    Write-Host "  :$port idle"
     continue
   }
   foreach ($procId in $pids) {
     if ($procId -le 0) { continue }
-    Write-Host "  :$port -> PID $procId (含子进程)"
+    Write-Host "  :$port -> PID $procId (tree)"
     & taskkill.exe /T /F /PID $procId | Out-Null
   }
 }
+
+Write-Host ""
+Write-Host "Port cleanup finished."