Add first pass of the web interface: Sites index + detail, via Livewire

Home page is now a Livewire-powered, searchable/paginated Site list
(search by domain) instead of the stock Laravel welcome page. Clicking
a site goes to a plain controller-rendered detail page listing its
pages. Shared layout at resources/views/components/layouts/app.blade.php.

composer.json

@@ -8,7 +8,8 @@
     "require": {
         "php": "^8.3",
         "laravel/framework": "^13.8",
-        "laravel/tinker": "^3.0"
+        "laravel/tinker": "^3.0",
+        "livewire/livewire": "^4.3"
     },
     "require-dev": {
         "fakerphp/faker": "^1.23",