Refactor catalog to use coordinate-based GraphQL endpoints

Replace entity-specific queries (GetProductsNearHub, GetOffersByHub, GetHubsForProduct, GetSuppliersForProduct) with unified coordinate-based endpoints (NearestHubs, NearestOffers, NearestSuppliers, RouteToCoordinate). This simplifies backend architecture from 18 to 8 core endpoints while maintaining identical UI/UX behavior.

All composables and pages now use coordinates + client-side grouping instead of specialized backend queries. For global product filtering, uses center point (0,0) with 20000km radius.

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

app/composables/useCatalogProducts.ts

@@ -1,8 +1,11 @@
 import {
   GetProductsDocument,
-  GetProductsBySupplierDocument,
-  GetProductsNearHubDocument
+  GetNodeDocument,
+  NearestOffersDocument
 } from '~/composables/graphql/public/geo-generated'
+import {
+  GetSupplierProfileDocument
+} from '~/composables/graphql/public/exchange-generated'
 
 // Shared state
 const items = ref<any[]>([])
@@ -27,23 +30,89 @@ export function useCatalogProducts() {
       let data
 
       if (filterSupplierUuid.value) {
-        // Products from specific supplier
-        data = await execute(
-          GetProductsBySupplierDocument,
+        // Products from specific supplier - get supplier coordinates first
+        const supplierData = await execute(
+          GetSupplierProfileDocument,
           { supplierUuid: filterSupplierUuid.value },
           'public',
-          'geo'
+          'exchange'
         )
-        items.value = data?.productsBySupplier || []
+        const supplier = supplierData?.getSupplierProfile
+
+        if (!supplier?.latitude || !supplier?.longitude) {
+          console.warn('Supplier has no coordinates')
+          items.value = []
+        } else {
+          // Get offers near supplier and group by product
+          const offersData = await execute(
+            NearestOffersDocument,
+            {
+              lat: supplier.latitude,
+              lon: supplier.longitude,
+              radius: 500
+            },
+            'public',
+            'geo'
+          )
+
+          // Group offers by product
+          const productsMap = new Map<string, any>()
+          offersData?.nearestOffers?.forEach((offer: any) => {
+            if (offer?.productUuid) {
+              if (!productsMap.has(offer.productUuid)) {
+                productsMap.set(offer.productUuid, {
+                  uuid: offer.productUuid,
+                  name: offer.productName,
+                  offersCount: 0
+                })
+              }
+              productsMap.get(offer.productUuid)!.offersCount++
+            }
+          })
+          items.value = Array.from(productsMap.values())
+        }
       } else if (filterHubUuid.value) {
-        // Products near hub
-        data = await execute(
-          GetProductsNearHubDocument,
-          { hubUuid: filterHubUuid.value },
+        // Products near hub - get hub coordinates first
+        const hubData = await execute(
+          GetNodeDocument,
+          { uuid: filterHubUuid.value },
           'public',
           'geo'
         )
-        items.value = data?.productsNearHub || []
+        const hub = hubData?.node
+
+        if (!hub?.latitude || !hub?.longitude) {
+          console.warn('Hub has no coordinates')
+          items.value = []
+        } else {
+          // Get offers near hub and group by product
+          const offersData = await execute(
+            NearestOffersDocument,
+            {
+              lat: hub.latitude,
+              lon: hub.longitude,
+              radius: 500
+            },
+            'public',
+            'geo'
+          )
+
+          // Group offers by product
+          const productsMap = new Map<string, any>()
+          offersData?.nearestOffers?.forEach((offer: any) => {
+            if (offer?.productUuid) {
+              if (!productsMap.has(offer.productUuid)) {
+                productsMap.set(offer.productUuid, {
+                  uuid: offer.productUuid,
+                  name: offer.productName,
+                  offersCount: 0
+                })
+              }
+              productsMap.get(offer.productUuid)!.offersCount++
+            }
+          })
+          items.value = Array.from(productsMap.values())
+        }
       } else {
         // All products
         data = await execute(