feat(installer): add powershell installer

install.ps1

@@ -0,0 +1,56 @@
+$ErrorActionPreference = "Stop"
+$InstallPath = "$env:ProgramData\defendnot"
+
+switch -Wildcard ($env:PROCESSOR_ARCHITECTURE) {
+    "AMD64"   { $arch = "x64" }
+    "x86"     { $arch = "x86" }
+    "ARM64"   { $arch = "ARM64" }
+    default   {
+        Write-Error "Unknown architecture: $($env:PROCESSOR_ARCHITECTURE)"
+        exit 1
+    }
+}
+
+$repo = "es3n1n/defendnot"
+$apiReleaseUrl = "https://api.github.com/repos/$repo/releases/latest"
+$headers = @{ 'User-Agent'="defendnot-install/1.0" }
+
+try {
+    $release = Invoke-RestMethod -Uri $apiReleaseUrl -Headers $headers
+} catch {
+    Write-Error "Failed to get latest release info: $_"
+    exit 2
+}
+
+$zipAsset = $release.assets | Where-Object { $_.name -ieq "$arch.zip" }
+if (-not $zipAsset) {
+    Write-Error "Release does not contain asset for $arch"
+    exit 3
+}
+
+$zipUrl = $zipAsset.browser_download_url
+$zipPath = Join-Path $env:TEMP "defendnot-$arch.zip"
+
+Write-Host "Downloading $($zipAsset.name)..."
+Invoke-WebRequest -Uri $zipUrl -OutFile $zipPath
+
+If (!(Test-Path $InstallPath)) {
+    New-Item -Type Directory -Path $InstallPath -Force | Out-Null
+}
+
+if (Test-Path $InstallPath) {
+    Write-Host "Removing previous installation..."
+    Remove-Item $InstallPath -Force -Recurse -ErrorAction SilentlyContinue
+}
+
+New-Item -Type Directory -Path $InstallPath -ErrorAction SilentlyContinue | Out-Null
+
+Write-Host "Extracting to $InstallPath..."
+Add-Type -AssemblyName System.IO.Compression.FileSystem
+[System.IO.Compression.ZipFile]::ExtractToDirectory($zipPath, $InstallPath)
+Remove-Item $zipPath
+
+Write-Host "`nDefendnot installed to $InstallPath"
+Write-Host "Starting..."
+Write-Host "Args: $args"
+& "$InstallPath\defendnot-loader.exe" @args