Phase 1-2 : socle Loki, design system et connexion Ollama

- Scaffold full-stack : backend FastAPI + frontend React/Vite/TS/Tailwind
- Design system fidèle au thème (palette ambre/café, JetBrains Mono, tokens Tailwind)
- Layout 3 panneaux : activity bar, historique/fichiers, chat, aperçu
- Connexion Ollama : statut live, liste des modèles, pull avec progression SSE, sélecteur de modèle
- Vue Configuration (Frame 2) : modèles, génération, outils, invite système
- Dockerfile multi-stage + docker-compose (Ollama externe par défaut, profil ollama optionnel)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SVay7z3y7q2gEe54ByAE6N

frontend/tailwind.config.ts

@@ -0,0 +1,59 @@
+import type { Config } from "tailwindcss";
+
+/**
+ * Système de design « Loki » — extrait fidèlement du visuel Atelier_Agent.
+ * Thème sombre chaleureux (café / ambre).
+ */
+export default {
+  content: ["./index.html", "./src/**/*.{ts,tsx}"],
+  theme: {
+    extend: {
+      colors: {
+        // Fonds
+        base: "#1a1714",
+        bar: "#1d1a15",
+        panel: "#1c1814",
+        sunken: "#161310",
+        // Surfaces / cartes
+        card: "#211d18",
+        "card-soft": "#221e18",
+        "card-deep": "#1f1b16",
+        // Bordures
+        line: "#2c2720",
+        "line-soft": "#262219",
+        "line-strong": "#322d26",
+        // Accent ambre
+        accent: "#f0a15c",
+        "accent-1": "#f4ad6c",
+        "accent-2": "#df7c4c",
+        // Statuts
+        ok: "#86c79a",
+        info: "#5b8fb0",
+        warn: "#c98b5b",
+        // Textes
+        ink: "#efe9df",
+        "ink-2": "#cfc5b6",
+        "ink-3": "#bdb3a4",
+        muted: "#9a9082",
+        "muted-2": "#8a8175",
+        "muted-3": "#766d60",
+        "muted-4": "#6a6256",
+        label: "#7a7164",
+      },
+      fontFamily: {
+        sans: ['"Hanken Grotesk"', "system-ui", "sans-serif"],
+        mono: ['"JetBrains Mono"', "ui-monospace", "monospace"],
+      },
+      borderRadius: {
+        card: "14px",
+      },
+      boxShadow: {
+        frame: "0 24px 60px rgba(0,0,0,.35)",
+      },
+      backgroundImage: {
+        "accent-grad": "linear-gradient(140deg, #f4ad6c, #df7c4c)",
+      },
+    },
+  },
+  plugins: [],
+} satisfies Config;