Fix product URLs, prerender routes and links

Update routes and URL handling for product pages and improve prerender behavior. Changes include:

- data/pricing.json: change summer camp URL to the canonical "/summer-camp" path.
- nuxt.config.js: set prerender.failOnError = false and clean up the prerender routes list (replace old product slugs with new ones, remove duplicated entries, and consolidate gallery/news/calendar/stories routes).
- pages/destinations/[id].vue: switch product links to use a productUrl helper and add mapping rules so autumn-*/winter-* IDs route to /products/autumn and /products/winter, and the summer-camp ID routes to /summer-camp.

These changes align link generation with updated product routes and make prerendering more robust.

pages/destinations/[id].vue

@@ -62,7 +62,7 @@
           <NuxtLink
             v-for="p in relatedProducts"
             :key="p.id"
-            :to="`/products/${p.id}`"
+            :to="productUrl(p.id)"
             class="product-link"
           >
             <span class="product-name">{{ p.name }}</span>
@@ -179,6 +179,13 @@ const relatedProducts = computed(() => (dest.value?.relatedProducts || [])
   .map(pid => allVersions.value.find(v => v.id === pid))
   .filter(Boolean)
 )
+
+function productUrl(id) {
+  if (id.startsWith('autumn-')) return '/products/autumn'
+  if (id.startsWith('winter-')) return '/products/winter'
+  if (id === 'summer-camp') return '/summer-camp'
+  return `/products/${id}`
+}
 </script>
 
 <style scoped>