🌐 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/ProjectController.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Http\Resources\ProjectResource;
+use App\Models\Project;
+
+class ProjectController extends Controller
+{
+    public function index()
+    {
+        $projects = Project::with('skills')->ordered()->get();
+
+        return ProjectResource::collection($projects)
+            ->additional(['meta' => ['lang' => app()->getLocale()]]);
+    }
+
+    public function show(string $slug)
+    {
+        $project = Project::with('skills')->where('slug', $slug)->firstOrFail();
+
+        return (new ProjectResource($project))
+            ->additional(['meta' => ['lang' => app()->getLocale()]]);
+    }
+}