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/assets/channel-DZA6uvxN.js

@@ -0,0 +1 @@
+import{U as a,M as n}from"./mermaid.core-DaNhpuX9.js";const t=(r,o)=>a.lang.round(n.parse(r)[o]);export{t as c};