Fix Windows installer script path in release workflow

.github/workflows/release.yml

@@ -234,7 +234,7 @@ jobs:
           $selfContained = "${{ matrix.self_contained }}" -eq "true"
           $publishDir = if ($selfContained) { "publish/windows-$arch" } else { "publish/windows-$arch-lite" }
           $outputDir = "build-installer"
-          $installerScript = "LanMountainDesktop/packaging/windows/LanMountainDesktop.iss"
+          $installerScript = "LanMountainDesktop/installer/LanMountainDesktop.iss"
 
           New-Item -ItemType Directory -Path $outputDir -Force | Out-Null
 
@@ -251,6 +251,11 @@ jobs:
             exit 1
           }
 
+          if (-not (Test-Path $installerScript)) {
+            Write-Error "Installer script not found: $(Join-Path $PWD $installerScript)"
+            exit 1
+          }
+
           $publishDir = (Resolve-Path $publishDir).Path
           $outputDir = (Resolve-Path $outputDir).Path
           $installerScript = (Resolve-Path $installerScript).Path