🌐 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/Resources/ProjectResource.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class ProjectResource extends JsonResource
+{
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'slug' => $this->slug,
+            'title' => $this->getTranslated('title_key'),
+            'description' => $this->getTranslated('description_key'),
+            'short_description' => $this->getTranslated('short_description_key'),
+            'image' => $this->image,
+            'url' => $this->url,
+            'github_url' => $this->github_url,
+            'date_completed' => $this->date_completed?->format('Y-m-d'),
+            'is_featured' => $this->is_featured,
+            'skills' => SkillResource::collection($this->whenLoaded('skills')),
+        ];
+    }
+}