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/components/CalcResultContent.vue

@@ -64,7 +64,7 @@
 </template>
 
 <script setup lang="ts">
-import { GetOffersByHubDocument } from '~/composables/graphql/public/geo-generated'
+import { GetNodeDocument, NearestOffersDocument, RouteToCoordinateDocument } from '~/composables/graphql/public/geo-generated'
 import type { RouteStageItem } from '~/components/RouteStagesList.vue'
 import { GetOfferDocument, GetSupplierProfileByTeamDocument } from '~/composables/graphql/public/exchange-generated'
 
@@ -106,17 +106,68 @@ type ProductRouteOption = {
 
 const fetchOffersByHub = async () => {
   if (!productUuid.value || !destinationUuid.value) return null
-  const { client } = useApolloClient('publicGeo')
 
-  const { data } = await client.query({
-    query: GetOffersByHubDocument,
-    variables: {
-      hubUuid: destinationUuid.value,
+  // 1. Get hub node to get coordinates
+  const hubData = await execute(GetNodeDocument, { uuid: destinationUuid.value }, 'public', 'geo')
+  const hub = hubData?.node
+
+  if (!hub?.latitude || !hub?.longitude) {
+    console.warn('Hub has no coordinates')
+    return null
+  }
+
+  // 2. Find offers near hub for this product
+  const offersData = await execute(
+    NearestOffersDocument,
+    {
+      lat: hub.latitude,
+      lon: hub.longitude,
       productUuid: productUuid.value,
+      radius: 500,
       limit: 5
-    }
-  })
-  return data
+    },
+    'public',
+    'geo'
+  )
+
+  const offers = offersData?.nearestOffers || []
+
+  // 3. For each offer, get route to hub coordinates
+  const offersWithRoutes = await Promise.all(
+    offers.map(async (offer: any) => {
+      try {
+        const routeData = await execute(
+          RouteToCoordinateDocument,
+          {
+            offerUuid: offer.uuid,
+            lat: hub.latitude,
+            lon: hub.longitude
+          },
+          'public',
+          'geo'
+        )
+        return {
+          sourceUuid: offer.uuid,
+          sourceName: offer.productName,
+          sourceLat: offer.latitude,
+          sourceLon: offer.longitude,
+          distanceKm: routeData?.routeToCoordinate?.distanceKm,
+          routes: routeData?.routeToCoordinate?.routes || []
+        }
+      } catch (e) {
+        console.warn('No route found for offer:', offer.uuid, e)
+        return {
+          sourceUuid: offer.uuid,
+          sourceName: offer.productName,
+          sourceLat: offer.latitude,
+          sourceLon: offer.longitude,
+          routes: []
+        }
+      }
+    })
+  )
+
+  return { offersByHub: offersWithRoutes }
 }
 
 const { data: productRoutesData, pending, error } = await useAsyncData(