Show linked domains on cards and fix Email leftovers.

Display hosted_sites on account cards, scope Afia and Settings to hosting,
add hosting_settings for notifications, and remove mailbox UI from the
hosting layout and account pages.

Co-authored-by: Cursor <cursoragent@cursor.com>

resources/views/layouts/hosting.blade.php

@@ -21,7 +21,6 @@
             @include('partials.topbar')
             <main class="flex-1 p-6 pb-24 lg:p-6 lg:pb-6">
                 @include('partials.flash')
-                @include('partials.mailbox-link-banner')
                 @yield('content')
             </main>
         </div>