Prepare Void Bastion alpha 7 release

packaging/windows/build.ps1

@@ -2,11 +2,30 @@ param(
     [Parameter(Mandatory = $true)]
     [string]$GodotExe,
 
-    [Parameter(Mandatory = $true)]
     [string]$MakeNsisExe
 )
 
 $ErrorActionPreference = "Stop"
+$nsisCandidates = @()
+if (-not [string]::IsNullOrWhiteSpace($MakeNsisExe)) {
+    $nsisCandidates += $MakeNsisExe
+} else {
+    $pathNsis = Get-Command "makensis.exe" -ErrorAction SilentlyContinue
+    if ($pathNsis) {
+        $nsisCandidates += $pathNsis.Source
+    }
+    $nsisCandidates += @(
+        (Join-Path $env:LOCALAPPDATA "Programs\NSIS-3.13\makensis.exe"),
+        "C:\Program Files (x86)\NSIS\makensis.exe",
+        "C:\Program Files\NSIS\makensis.exe"
+    )
+    $MakeNsisExe = $nsisCandidates | Where-Object { Test-Path -LiteralPath $_ -PathType Leaf } | Select-Object -First 1
+}
+
+if ([string]::IsNullOrWhiteSpace($MakeNsisExe)) {
+    throw "NSIS wurde nicht gefunden. Installiere NSIS oder übergib -MakeNsisExe mit dem Pfad zu makensis.exe."
+}
+
 $projectRoot = (Resolve-Path (Join-Path $PSScriptRoot "..\..")).Path
 $gameExe = Join-Path $projectRoot "build\windows\Void-Bastion.exe"
 $installer = Join-Path $projectRoot "dist\Void-Bastion-Setup-x64.exe"