🎉 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>

api/app/Http/Controllers/Controller.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace App\Http\Controllers;
+
+abstract class Controller
+{
+    //
+}

api/app/Http/Middleware/VerifyApiKey.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class VerifyApiKey
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        $apiKey = $request->header('X-API-Key');
+
+        if (!$apiKey || $apiKey !== config('app.api_key')) {
+            return response()->json([
+                'error' => [
+                    'code' => 'INVALID_API_KEY',
+                    'message' => 'Invalid or missing API key',
+                ]
+            ], 401);
+        }
+
+        return $next($request);
+    }
+}