🌐 Add full i18n system frontend + API (Story 1.3)

Nuxt i18n with lazy-loaded JSON files, localized routes, hreflang SEO tags,
LanguageSwitcher component. Laravel SetLocale middleware, HasTranslations trait,
API Resources and Controllers for projects/skills with Accept-Language support.

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

api/routes/api.php

@@ -1,7 +1,13 @@
 <?php
 
+use App\Http\Controllers\Api\ProjectController;
+use App\Http\Controllers\Api\SkillController;
 use Illuminate\Support\Facades\Route;
 
 Route::get('/health', function () {
     return response()->json(['status' => 'ok']);
 });
+
+Route::get('/projects', [ProjectController::class, 'index']);
+Route::get('/projects/{slug}', [ProjectController::class, 'show']);
+Route::get('/skills', [SkillController::class, 'index']);