feat: use API base URL from env

frontend/src/api/client.ts

@@ -1,10 +1,10 @@
 import axios from "axios";
 import type {InternalAxiosRequestConfig} from "axios";
 
-const BASE_URL: string = "http://localhost:3000/api";
+const baseURL: string = import.meta.env.VITE_API_URL;
 
 const apiClient = axios.create({
-	baseURL: BASE_URL,
+	baseURL: baseURL,
 	headers: {
 		"Content-Type": "application/json",
 	},