fix: cors middleware 설정 추가

src/setupProxy.js

@@ -1,11 +0,0 @@
-const { createProxyMiddleware } = require('http-proxy-middleware');
-
-module.exports = function (app) {
-  app.use(
-    '/',
-    createProxyMiddleware({
-      changeOrigin: true,
-      target: 'http://localhost:8090'
-    })
-  );
-};