修改消息后台的启动和停止文件并整理文档

server/scripts/start-delivery-backend.ps1

@@ -54,6 +54,7 @@ foreach ($s in $services) {
 
 Ensure-Dir (Join-Path $root 'server\.runtime')
 $pidsFile = Join-Path $root 'server\.runtime\delivery-backend.pids.json'
-$pids | ConvertTo-Json -Depth 5 | Set-Content -Path $pidsFile -Encoding UTF8
+$json = $pids | ConvertTo-Json -Depth 5
+[IO.File]::WriteAllText($pidsFile, $json + "`r`n", (New-Object System.Text.UTF8Encoding($false)))
 Write-Host "Saved pids: $pidsFile"
 Write-Host "Done. Use test sender: node .\pages\mall\delivery\webhook-server\test-send.js"