Replace CRA proxy config with vite's proxy config

app/src/setupProxy.js

@@ -1,14 +0,0 @@
-/* eslint-disable @typescript-eslint/no-var-requires */
-/* eslint-disable no-undef */
-const { createProxyMiddleware } = require('http-proxy-middleware');
-
-module.exports = function (app) {
-    app.use(
-        '/chatapi',
-        createProxyMiddleware({
-            target: 'http://localhost:3001',
-            secure: false,
-            changeOrigin: true,
-        })
-    );
-};