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/vpn-login.js

@@ -286,7 +286,7 @@ async function main() {
   // Start SOCKS5 proxy only after VPN verified
   log("Starting SOCKS5 proxy on port 1080...");
   run("taskkill /F /IM node.exe /FI \"WINDOWTITLE eq socks5\"");
-  spawn("node", ["C:\\Users\\alexz\\vpn_scripts\\socks5.js"], {
+  spawn("node", ["" + process.env.USERPROFILE + "\\vpn_scripts\\socks5.js"], {
     detached: true,
     stdio: "ignore",
     windowsHide: true
@@ -441,7 +441,7 @@ async function reconnectVpn() {
     log("Reconnection successful!");
     // Restart socks5
     run("taskkill /F /IM node.exe /FI \"WINDOWTITLE eq socks5\"");
-    spawn("node", ["C:\\Users\\alexz\\vpn_scripts\\socks5.js"], {
+    spawn("node", ["" + process.env.USERPROFILE + "\\vpn_scripts\\socks5.js"], {
       detached: true,
       stdio: "ignore",
       windowsHide: true