🐛 Fix VITE_API_URL reference

frontend/src/client.ts

@@ -1,7 +1,7 @@
 import { ApolloClient, InMemoryCache } from "@apollo/client";
 
 const client = new ApolloClient({
-  uri: import.meta.env.VITE_API_URL || "http://localhost:8000/graphql/",
+  uri: `${import.meta.env.VITE_API_URL}/graphql/`,
   cache: new InMemoryCache(),
 });