first commit

frontend/vite.config.js

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+/* eslint-env node */
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+
+const allowedHosts = (process.env.VITE_ALLOWED_HOSTS || '')
+  .split(',')
+  .map((host) => host.trim())
+  .filter(Boolean);
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    allowedHosts: ['localhost', '127.0.0.1', 'booklibra.wisecolt-panda.net', ...allowedHosts]
+  }
+});