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

webpack.config.js

@@ -0,0 +1,33 @@
+const Encore = require('@symfony/webpack-encore');
+
+if (!Encore.isRuntimeEnvironmentConfigured()) {
+    Encore.configureRuntimeEnvironment(process.env.NODE_ENV || 'dev');
+}
+
+Encore
+    .setOutputPath('public/build/')
+    .setPublicPath('/build')
+
+    .addEntry('app', './assets/app.js')
+    .addEntry('admin', './assets/admin/index.tsx')
+
+    .splitEntryChunks()
+    .enableSingleRuntimeChunk()
+
+    .cleanupOutputBeforeBuild()
+    .enableSourceMaps(!Encore.isProduction())
+    .enableVersioning(Encore.isProduction())
+
+    .enableReactPreset()
+    .enableTypeScriptLoader()
+    .enablePostCssLoader()
+
+    .enableStimulusBridge('./assets/controllers.json')
+
+    .configureBabelPresetEnv((config) => {
+        config.useBuiltIns = 'usage';
+        config.corejs = '3.38';
+    })
+;
+
+module.exports = Encore.getWebpackConfig();