Update scripts to use dynamic username instead of hardcoded alexz

- setup-autologin-sshd.ps1: Uses $env:USERNAME, prompts for password
- setup-ssh-keys.ps1: Uses $env:USERNAME, prompts for public key
- install-nodejs.ps1: Uses $env:USERNAME in instructions
- vpn-login.js: Uses process.env.USERPROFILE for paths

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

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

apps/rego-tunnel/build/rego/setup-autologin-sshd.ps1

@@ -1,8 +1,15 @@
-# Setup OpenSSH Server and Auto-Login for alexz
+# Setup OpenSSH Server and Auto-Login
 # Run as Administrator in PowerShell
 
-$Username = "alexz"
-$Password = "Az@83278327$$@@"
+param(
+    [string]$Username = $env:USERNAME,
+    [string]$Password
+)
+
+if (-not $Password) {
+    $securePassword = Read-Host "Enter password for $Username" -AsSecureString
+    $Password = [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($securePassword))
+}
 
 Write-Host "=== Setting up OpenSSH Server ===" -ForegroundColor Cyan