feat: initialize project with Symfony, React, and Tailwind CSS setup

- Add package.json with development and production dependencies
- Create postcss.config.js for Tailwind CSS integration
- Implement AdminController for handling admin routes
- Add admin index template with React root element
- Create base template for consistent layout
- Configure TypeScript with tsconfig.json
- Set up Webpack configuration for asset management

src/Admin/Controller/AdminController.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Admin\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+
+class AdminController extends AbstractController
+{
+    #[Route('/admin/{reactRouting}', name: 'admin_app', requirements: ['reactRouting' => '.*'], defaults: ['reactRouting' => ''])]
+    public function index(): Response
+    {
+        return $this->render('admin/index.html.twig');
+    }
+}