Create frontend/vite.config.js

frontend/vite.config.js

@@ -0,0 +1,10 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+export default defineConfig({
+  plugins: [react()],
+  build: {
+    outDir: "../app/frontend_dist", // output goes into FastAPI app folder
+    emptyOutDir: true
+  }
+});