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.css

@@ -0,0 +1,19 @@
+/*!
+ * 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.
+ */
+:root, :host {
+  --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"); }
+
+.far,
+.fa-regular {
+  font-weight: 400; }