feat: Implement market functionality with ProductCard, useMarket composable, and market store

- Add ProductCard.vue component for displaying product details, including image, name, description, price, and stock status.
- Create useMarket.ts composable to manage market loading, data fetching, and real-time updates from Nostr.
- Introduce market.ts store to handle market, stall, product, and order states, along with filtering and sorting capabilities.
- Develop Market.vue page to present market content, including loading states, error handling, and product grid.
- Update router to include a new market route for user navigation.

src/router/index.ts

@@ -39,6 +39,15 @@ const router = createRouter({
         title: 'My Tickets',
         requiresAuth: true
       }
+    },
+    {
+      path: '/market',
+      name: 'market',
+      component: () => import('@/pages/Market.vue'),
+      meta: {
+        title: 'Market',
+        requiresAuth: true
+      }
     }
   ]
 })