try this shi

frontend/vite.config.js

@@ -0,0 +1,17 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    host: '0.0.0.0',
+    port: 3000,
+    proxy: {
+      '/api': {
+        target: process.env.VITE_API_URL || 'http://localhost:3001',
+        changeOrigin: true
+      }
+    }
+  }
+})
+