rego-tunnel: replace build folder with vpn_scripts

- Remove build folder (no longer building custom image)
- Add vpn_scripts folder with organized setup scripts
- Prefix setup scripts with numbers for execution order
- Add setup-all.bat for automated Windows setup
- Add dynamic vpn-startup.lnk shortcut (uses %USERNAME%)
- Include start.sh for container networking

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/rego-tunnel/vpn_scripts/03_setup-ssh-keys.ps1

@@ -0,0 +1,34 @@
+# Setup SSH Keys
+# Run as Administrator in PowerShell
+
+$Username = if ($env:REGO_USER) { $env:REGO_USER } else { $env:USERNAME }
+$PublicKey = if ($env:REGO_SSH_PUBKEY) { $env:REGO_SSH_PUBKEY } else { "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGHUQnw0WfeFRQx76UlImXXhu3xeOH41PmDRid8pWK1D default-key" }
+
+Write-Host "=== Setting up SSH Keys ===" -ForegroundColor Cyan
+Write-Host "Using username: $Username" -ForegroundColor Yellow
+
+# User authorized_keys
+$userSshDir = "C:\Users\$Username\.ssh"
+$userAuthKeys = "$userSshDir\authorized_keys"
+
+Write-Host "Creating user .ssh directory..." -ForegroundColor Yellow
+New-Item -ItemType Directory -Path $userSshDir -Force | Out-Null
+
+Write-Host "Adding key to user authorized_keys..." -ForegroundColor Yellow
+Add-Content -Path $userAuthKeys -Value $PublicKey -Force
+
+# Fix permissions for user file
+icacls $userAuthKeys /inheritance:r /grant "${Username}:F" /grant "SYSTEM:F"
+
+# Administrator authorized_keys (for admin users)
+$adminAuthKeys = "C:\ProgramData\ssh\administrators_authorized_keys"
+
+Write-Host "Adding key to administrators_authorized_keys..." -ForegroundColor Yellow
+Add-Content -Path $adminAuthKeys -Value $PublicKey -Force
+
+# Fix permissions for admin file (required by OpenSSH)
+icacls $adminAuthKeys /inheritance:r /grant "Administrators:F" /grant "SYSTEM:F"
+
+Write-Host ""
+Write-Host "SSH keys configured!" -ForegroundColor Green
+Write-Host "You can now SSH in with the configured key." -ForegroundColor Yellow