✨ Add skills page with category grouping (Story 2.4)

- Enhance Skill model with getCurrentLevel() and ordered scope
- Update SkillController to group by category with translated labels
- Add level and project_count to SkillResource
- Create skill.ts types (Skill, SkillCategory, SkillsResponse)
- Create useFetchSkills composable
- Create SkillCard component with animated progress bar
- Implement competences.vue with:
  - Responsive grid (2/3/4 columns)
  - Category sections with icons
  - Stagger animations (respects prefers-reduced-motion)
  - Loading/error/empty states
  - Placeholder for vis.js skill tree (Epic 3)

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

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

@@ -10,13 +10,36 @@ class SkillController extends Controller
 {
     public function index()
     {
-        $skills = Skill::ordered()->get()->groupBy('category');
+        $lang = app()->getLocale();
+        $skills = Skill::with('projects')->ordered()->get();
+        $grouped = $skills->groupBy('category');
 
-        $grouped = $skills->map(fn ($group) => SkillResource::collection($group));
+        $data = $grouped->map(function ($categorySkills, $category) use ($lang) {
+            return [
+                'category' => $category,
+                'category_label' => $this->getCategoryLabel($category, $lang),
+                'skills' => SkillResource::collection($categorySkills),
+            ];
+        })->values();
 
         return response()->json([
-            'data' => $grouped,
-            'meta' => ['lang' => app()->getLocale()],
+            'data' => $data,
+            'meta' => [
+                'lang' => $lang,
+                'total' => $skills->count(),
+            ],
         ]);
     }
+
+    private function getCategoryLabel(string $category, string $lang): string
+    {
+        $labels = [
+            'frontend' => ['fr' => 'Frontend', 'en' => 'Frontend'],
+            'backend' => ['fr' => 'Backend', 'en' => 'Backend'],
+            'tools' => ['fr' => 'Outils', 'en' => 'Tools'],
+            'soft_skills' => ['fr' => 'Soft Skills', 'en' => 'Soft Skills'],
+        ];
+
+        return $labels[strtolower($category)][$lang] ?? ucfirst($category);
+    }
 }