style(design): FINDING-004 — htmx vendorizat local, nu din CDN (offline-first)

Dashboard-ul incarca htmx din unpkg.com. Gateway-ul ruleaza offline (LXC/VPS
+ Cloudflare Tunnel); cand CDN-ul e blocat/inaccesibil, htmx nu se incarca si
dashboard-ul ramane static: zero polling (banner alerta blocate, coada,
mapari), butoanele de mapare nu trimit. Aceeasi decizie offline-first ca fontul
UI (FINDING-002, fara dependinta CDN).

Fix: vendorizez htmx.org@1.9.12 minificat in app/web/static/, montez StaticFiles
la /static in main.py, base.html refera /static/htmx.min.js. Verificat live:
window.htmx.version=1.9.12, fragment polls 200, zero regresie vizuala.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/web/templates/base.html

@@ -4,7 +4,7 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>{% block title %}Gateway RAR AUTOPASS{% endblock %}</title>
-  <script src="https://unpkg.com/htmx.org@1.9.12"></script>
+  <script src="/static/htmx.min.js"></script>
   <style>
     :root { --bg:#0f1115; --card:#181b22; --ink:#e6e9ef; --muted:#8b93a7; --line:#262b36;
             --ok:#3ecf8e; --warn:#e6b34a; --err:#e5605e; --accent:#5b8def; }