Fix geo GraphQL schema mismatch: camelCase → snake_case

All geo .graphql operations and consuming code updated to match
server schema which uses snake_case field/argument names.
Removed non-existent QuoteCalculations query, using NearestOffers instead.

graphql/operations/public/geo/NearestHubs.graphql

@@ -1,18 +1,17 @@
-query NearestHubs($lat: Float!, $lon: Float!, $radius: Float, $productUuid: String, $limit: Int, $useGraph: Boolean) {
-  nearestHubs(
+query NearestHubs($lat: Float!, $lon: Float!, $radius: Float, $productUuid: String, $limit: Int) {
+  nearest_hubs(
     lat: $lat
     lon: $lon
     radius: $radius
-    productUuid: $productUuid
+    product_uuid: $productUuid
     limit: $limit
-    useGraph: $useGraph
   ) {
     uuid
     name
     latitude
     longitude
     country
-    countryCode
-    transportTypes
+    country_code
+    transport_types
   }
 }