feat(dashboard): structure HTML + CSS complet

Ajout de la structure de base du dashboard Nanometrics :
- index.html avec header, grille agents, footer et 4 popups (détail, config agent, config serveur, SMART)
- css/app.css avec design system complet (tokens dark/light, composants, animations)
- Polices locales : Inter, JetBrains Mono, Share Tech Mono (woff2)
- Font Awesome 6.5.1 en local (vendor/fontawesome)

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

dashboard/vendor/fontawesome/css/regular.min.css

@@ -0,0 +1,6 @@
+/*!
+ * Font Awesome Free 6.5.1 by @fontawesome - https://fontawesome.com
+ * License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License)
+ * Copyright 2023 Fonticons, Inc.
+ */
+:host,:root{--fa-style-family-classic:"Font Awesome 6 Free";--fa-font-regular:normal 400 1em/1 "Font Awesome 6 Free"}@font-face{font-family:"Font Awesome 6 Free";font-style:normal;font-weight:400;font-display:block;src:url(../webfonts/fa-regular-400.woff2) format("woff2"),url(../webfonts/fa-regular-400.ttf) format("truetype")}.fa-regular,.far{font-weight:400}