chore: API_URL 환경 변수로 받아오기

Author: yewonJin

frontend/src/lib/axios.ts

@@ -1,5 +1,10 @@
 import axios, { AxiosRequestConfig, AxiosResponse } from "axios";
 
+const axiosInstance = axios.create({
+  baseURL: import.meta.env.VITE_API_URL,
+});
+
+export const Get = async <T>(
   url: string,
   config?: AxiosRequestConfig,
 ): Promise<AxiosResponse<T>> => {