🌐 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/app/Http/Controllers/Api/SkillController.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Http\Resources\SkillResource;
+use App\Models\Skill;
+
+class SkillController extends Controller
+{
+    public function index()
+    {
+        $skills = Skill::ordered()->get()->groupBy('category');
+
+        $grouped = $skills->map(fn ($group) => SkillResource::collection($group));
+
+        return response()->json([
+            'data' => $grouped,
+            'meta' => ['lang' => app()->getLocale()],
+        ]);
+    }
+}