refactor: getEnv -> getConfig

packages/server/next/app/env.ts

 /* eslint-disable @typescript-eslint/no-explicit-any */
 "use client";
 
-/**
- * A helper function to get environment variables from the window object
- * @param name - The name of the environment variable to get
- * @returns The value of the environment variable
- */
-export const getEnv = (name: string) => {
+export const getConfig = (name: string) => {
   if (typeof window === "undefined") return undefined;
   return (window as any).LLAMAINDEX?.[name];
 };

packages/server/next/app/page.tsx

 "use client";
 import { ChatSection } from "@llamaindex/chat-ui";
 import { useChat } from "ai/react";
-import { getEnv } from "./env";
+import { getConfig } from "./env";
 
 export default function Page() {
-  const handler = useChat({ api: getEnv("CHAT_API") });
+  const handler = useChat({ api: getConfig("CHAT_API") });
   return (
     <div className="flex h-screen items-center justify-center">
       <ChatSection