feat: handle VITE_PUBLIC_URL

vite.config.js

@@ -1,11 +1,20 @@
 import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
+import dotenv from 'dotenv';
+dotenv.config();
 
 export default defineConfig(() => {
+  const publicUrl = process.env.VITE_PUBLIC_URL || 'http://localhost:5173';
+
   return {
     define: {
       'import.meta.env.VITE_BACKEND_URL': JSON.stringify(process.env.VITE_BACKEND_URL),
+      'import.meta.env.VITE_PUBLIC_URL': JSON.stringify(publicUrl),
     }, 
+    server: {
+      host: new URL(publicUrl).hostname,
+      port: parseInt(new URL(publicUrl).port),
+    },
     build: {
       outDir: 'build',
       manifest: true,