✨ Add projects gallery page with responsive grid (Story 2.2)

- Create useFetchProjects composable for API integration
- Implement responsive grid layout (1/2/3/4 columns)
- Add stagger fadeInUp animation with prefers-reduced-motion support
- Include loading skeleton, error state with retry, and empty state
- Configure SEO meta tags via useSeo composable
- Update Project model ordered scope for proper sorting

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

frontend/i18n/fr.json

@@ -11,12 +11,13 @@
   "common": {
     "continue": "Continuer",
     "back": "Retour",
-    "discover": "Découvrir",
+    "discover": "D\u00e9couvrir",
     "close": "Fermer",
     "loading": "Chargement...",
     "language": "Langue",
-    "back_home": "Retour à l'accueil",
-    "back_to_adventure": "Retour à l'aventure"
+    "back_home": "Retour \u00e0 l'accueil",
+    "back_to_adventure": "Retour \u00e0 l'aventure",
+    "retry": "R\u00e9essayer"
   },
   "landing": {
     "title": "Bienvenue dans mon univers",
@@ -75,8 +76,12 @@
     "meta_description": "D\u00e9veloppeur Full-Stack sp\u00e9cialis\u00e9 en Vue.js, Nuxt, Laravel. D\u00e9couvrez mon profil et mes projets en 30 secondes."
   },
   "projects": {
+    "title": "Mes Projets",
+    "page_title": "Projets | Skycel",
+    "page_description": "D\u00e9couvrez les projets r\u00e9alis\u00e9s par C\u00e9lian, d\u00e9veloppeur web full-stack.",
     "discover": "D\u00e9couvrir",
     "no_projects": "Aucun projet pour le moment",
+    "load_error": "Impossible de charger les projets...",
     "view_all": "Voir tous les projets"
   },
   "pages": {