🌐 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

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+<?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()]]);
+    }
+}

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

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+<?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()],
+        ]);
+    }
+}

api/app/Http/Middleware/SetLocale.php

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+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class SetLocale
+{
+    protected array $supportedLocales = ['fr', 'en'];
+    protected string $fallbackLocale = 'fr';
+
+    public function handle(Request $request, Closure $next): Response
+    {
+        $locale = $this->parseAcceptLanguage($request->header('Accept-Language'));
+
+        app()->setLocale($locale);
+        $request->attributes->set('locale', $locale);
+
+        return $next($request);
+    }
+
+    protected function parseAcceptLanguage(?string $header): string
+    {
+        if (!$header) {
+            return $this->fallbackLocale;
+        }
+
+        $locales = [];
+        foreach (explode(',', $header) as $part) {
+            $part = trim($part);
+            if (preg_match('/^([a-z]{2})(?:-[A-Z]{2})?(?:;q=([0-9.]+))?$/i', $part, $matches)) {
+                $lang = strtolower($matches[1]);
+                $quality = isset($matches[2]) ? (float) $matches[2] : 1.0;
+                $locales[$lang] = $quality;
+            }
+        }
+
+        arsort($locales);
+
+        foreach (array_keys($locales) as $lang) {
+            if (in_array($lang, $this->supportedLocales)) {
+                return $lang;
+            }
+        }
+
+        return $this->fallbackLocale;
+    }
+}

api/app/Http/Resources/ProjectResource.php

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+<?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')),
+        ];
+    }
+}

api/app/Http/Resources/SkillResource.php

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+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class SkillResource extends JsonResource
+{
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'slug' => $this->slug,
+            'name' => $this->getTranslated('name_key'),
+            'description' => $this->getTranslated('description_key'),
+            'icon' => $this->icon,
+            'category' => $this->category,
+            'max_level' => $this->max_level,
+            'pivot' => $this->when($this->pivot, fn () => [
+                'level_before' => $this->pivot->level_before,
+                'level_after' => $this->pivot->level_after,
+            ]),
+        ];
+    }
+}