feat(catalog): two-level offers navigation + map auto-centering

- Add fitBounds to CatalogMap for auto-centering on all points
- Add productUuid filter to useCatalogOffers composable
- Create useCatalogProducts composable for products list
- Update offers/index.vue: show products first, then offers by product
- Update offers/map.vue: same two-level navigation
- Add translations for new UI elements

Navigation flow:
/catalog/offers → product selection → offers for that product

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/composables/useCatalogOffers.ts

@@ -6,6 +6,7 @@ const PAGE_SIZE = 24
 const items = ref<any[]>([])
 const total = ref(0)
 const selectedFilter = ref('all')
+const productUuid = ref<string | null>(null)
 const isLoading = ref(false)
 const isLoadingMore = ref(false)
 const isInitialized = ref(false)
@@ -39,7 +40,12 @@ export function useCatalogOffers() {
       const status = selectedFilter.value === 'active' ? 'active' : null
       const data = await execute(
         GetOffersDocument,
-        { limit: PAGE_SIZE, offset, status },
+        {
+          limit: PAGE_SIZE,
+          offset,
+          status,
+          productUuid: productUuid.value
+        },
         'public',
         'exchange'
       )
@@ -52,6 +58,14 @@ export function useCatalogOffers() {
     }
   }
 
+  const setProductUuid = (uuid: string | null) => {
+    if (productUuid.value !== uuid) {
+      productUuid.value = uuid
+      isInitialized.value = false
+      items.value = []
+    }
+  }
+
   const loadMore = async () => {
     if (isLoadingMore.value) return
     isLoadingMore.value = true
@@ -80,6 +94,7 @@ export function useCatalogOffers() {
     items,
     total,
     selectedFilter,
+    productUuid,
     filters,
     isLoading,
     isLoadingMore,
@@ -87,6 +102,7 @@ export function useCatalogOffers() {
     canLoadMore,
     fetchPage,
     loadMore,
-    init
+    init,
+    setProductUuid
   }
 }