refactor: migrate users/companies pages to Rappasoft tables; remove unused welcome view

Point 2 (migrate to Rappasoft tables):
- /admin/users now renders <livewire:user-table /> (+ a New user button)
  instead of the custom admin-users component
- /companies now renders <livewire:company-table /> (+ New company button)
  instead of the hand-rolled card list

Point 3 (delete): removed resources/views/welcome.blade.php (unused — '/'
redirects to dashboard).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

resources/views/admin/users.blade.php

@@ -15,7 +15,12 @@
     <div class="py-12">
         <div class="max-w-5xl mx-auto sm:px-6 lg:px-8">
             <div class="bg-white rounded-lg shadow p-6">
-                @livewire('admin-users')
+                <div class="flex justify-end mb-4">
+                    <a href="{{ route('admin.users.create') }}" class="btn btn-primary btn-sm gap-1" wire:navigate>
+                        <x-heroicon-o-plus class="w-4 h-4" /> {{ __('New user') }}
+                    </a>
+                </div>
+                <livewire:user-table />
             </div>
         </div>
     </div>