fix: AIUI /aiui/ base path, nginx alias cycle, VPN auth, container boot

- AIUI: rebuild with /aiui/ base path (router, chunk loader, SW scope)
- nginx: remove alias from /aiui/ location (caused try_files redirect cycle)
- VPN: WireGuard standalone setup, auth improvements
- ISO: build script hardening, service file updates
- first-boot-containers: networking stack fixes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

demo/aiui/registerSW.js

@@ -1 +1 @@
-if('serviceWorker' in navigator) {window.addEventListener('load', () => {navigator.serviceWorker.register('/sw.js', { scope: '/' })})}
+if('serviceWorker' in navigator) {window.addEventListener('load', () => {navigator.serviceWorker.register('/aiui/sw.js', { scope: '/aiui/' })})}