🎉 Init monorepo Nuxt 4 + Laravel 12 (Story 1.1)

Setup complet de l'infrastructure projet :
- Frontend Nuxt 4 (SSR, TypeScript, i18n, Pinia, TailwindCSS)
- Backend Laravel 12 API-only avec middleware X-API-Key et CORS
- Design tokens (sky-dark, sky-accent, sky-text) et polices (Merriweather, Inter)
- Documentation planning et implementation artifacts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/nuxt.config.ts

@@ -0,0 +1,44 @@
+export default defineNuxtConfig({
+  devtools: { enabled: true },
+
+  ssr: true,
+
+  future: {
+    compatibilityVersion: 4,
+  },
+
+  modules: [
+    '@nuxtjs/i18n',
+    '@pinia/nuxt',
+    '@nuxt/image',
+    '@nuxtjs/sitemap',
+  ],
+
+  css: ['~/assets/css/main.css'],
+
+  postcss: {
+    plugins: {
+      tailwindcss: {},
+      autoprefixer: {},
+    },
+  },
+
+  i18n: {
+    locales: ['fr', 'en'],
+    defaultLocale: 'fr',
+    strategy: 'prefix_except_default',
+  },
+
+  app: {
+    pageTransition: { name: 'page', mode: 'out-in' },
+  },
+
+  runtimeConfig: {
+    public: {
+      apiUrl: process.env.NUXT_PUBLIC_API_URL || 'http://localhost:8000/api',
+      apiKey: process.env.NUXT_PUBLIC_API_KEY || '',
+    },
+  },
+
+  compatibilityDate: '2025-01-01',
+})