mbproxy/install: add Windows service-management batch files

Four simple .bat files — install / remove / start / stop-service — that
manage the 'mbproxy' Windows service against the Mbproxy.exe in their
own folder. publish.ps1 / publish.sh copy them into each win-* publish
flavour, so a published Windows folder is self-managing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

mbproxy/install/publish.ps1

@@ -12,7 +12,8 @@
 
     Each folder also receives a current appsettings.json — the platform-appropriate
     install template (Windows or Linux, selected by -Rid) — so every publish-out
-    flavour is a complete, deployable folder.
+    flavour is a complete, deployable folder. For a win-* RID the four service
+    batch files (install/remove/start/stop-service.bat) are copied in as well.
 
     The runtime is selected with -Rid (default win-x64). The binary is Mbproxy.exe on
     Windows RIDs and Mbproxy on Linux/macOS RIDs.
@@ -93,6 +94,22 @@ foreach ($flavour in 'self-contained','framework-dependent') {
     Write-Host ("  {0,-22} <- {1}" -f $flavour, $configTemplate)
 }
 
+# ── Ship the Windows service-management batch files (win RIDs only) ─────────────
+# install-service / remove-service / start-service / stop-service all act on the
+# Mbproxy.exe in their own folder, so the published folder is self-managing.
+if ($Rid -like 'win-*') {
+    $serviceScripts = 'install-service.bat','remove-service.bat','start-service.bat','stop-service.bat'
+    Write-Host "`n=== Service scripts ===" -ForegroundColor Cyan
+    foreach ($flavour in 'self-contained','framework-dependent') {
+        foreach ($script in $serviceScripts) {
+            $src = Join-Path $repoRoot "install\$script"
+            if (-not (Test-Path $src)) { throw "Cannot find service script: $src" }
+            Copy-Item -LiteralPath $src -Destination (Join-Path $OutputDir "$flavour\$script") -Force
+        }
+        Write-Host ("  {0,-22} <- install\*-service.bat" -f $flavour)
+    }
+}
+
 function Format-Size {
     param([long]$Bytes)
     if ($Bytes -ge 1MB) { '{0:N1} MB' -f ($Bytes / 1MB) }