feat: install and configure Inertia.js with React

- Install inertia-laravel, @inertiajs/react, react, @vitejs/plugin-react
- Add HandleInertiaRequests middleware registered in web group
- Create Inertia root template (resources/views/app.blade.php)
- Add React entry point and page components (resources/js/)
- Add Inertia demo route (/inertia-test)
- HomeController reverted to Blade (index page stays original)
- Remove inertia-test2 test route

resources/js/ssr.jsx

@@ -0,0 +1,12 @@
+import { createInertiaApp } from '@inertiajs/react'
+import { createRoot } from 'react-dom/client'
+
+createInertiaApp({
+  resolve: name => {
+    const pages = import.meta.glob('./pages/**/*.jsx', { eager: true })
+    return pages[`./pages/${name}.jsx`]
+  },
+  setup({ el, App, props }) {
+    createRoot(el).render(<App {...props} />)
+  },
+})