add old frontend code back

frontend/vite.config.ts

@@ -0,0 +1,17 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import tailwindcss from '@tailwindcss/vite'
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [react(), tailwindcss()],
+  server: {
+    proxy: {
+      '/api/v1': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
+        secure: false,
+      }
+    }
+  }
+})