feat: add bundle feature with 2x/3x set options

- Created BundleSelector component for selecting bundle options
- Updated ProductDetail to show bundle options
- Added bundle translations for all 4 locales
- Added GraphQL query for bundle products
- Updated TypeScript types for attributes
- Saleor backend: created bundle products for all base products

src/i18n/messages/fr.json

@@ -312,6 +312,13 @@
     "urgency2": "Dans les paniers de 2,5K personnes - achetez avant qu'il ne disparaisse!",
     "urgency3": "7 562 personnes ont vu ce produit ces dernières 24 heures!"
   },
+  "Bundle": {
+    "selectBundle": "Choisir le Pack",
+    "singleUnit": "1 Unité",
+    "xSet": "{count}x Set",
+    "save": "Économisez {amount}",
+    "perUnit": "par unité"
+  },
   "Newsletter": {
     "stayConnected": "Restez Connectés",
     "joinCommunity": "Rejoignez Notre Communauté",