Modernize dependencies: replace abandoned packages, update versions

- Replace flowframe/laravel-trend with direct Eloquent DB queries
- Replace srmklive/paypal (abandoned) with new PayPalService using PayPal REST API v2 via Guzzle
- Remove old config/paypal.php, migrate to config('habbo.paypal.*')
- Update blade templates to use habbo.paypal config
- Bump npm packages to latest: @inertiajs/react, axios, esbuild, eslint, sass, tailwindcss, etc.
- Run composer update and yarn upgrade

resources/themes/atom/views/shop/shop.blade.php

@@ -100,7 +100,7 @@
  {{ auth()->user() ? __('Current balance: $:balance', ['balance' => auth()->user()->website_balance]) : __('Current balance: Login required') }}
  </div>
 
- @if(config('paypal.live.client_id') && config('paypal.live.client_secret') && config('paypal.live.client_id') !== 'test_client_id')
+ @if(config('habbo.paypal.live.client_id') && config('habbo.paypal.live.client_secret') && config('habbo.paypal.live.client_id') !== 'test_client_id')
  <form action="{{ route('paypal.process-transaction') }}" method="GET" class="mt-3">
  @csrf
 

resources/themes/dusk/views/shop/shop.blade.php

@@ -94,7 +94,7 @@
                     {{ __('Current balance: $:balance', ['balance' => auth()->user()->website_balance]) }}
                 </div>
 
-                @if(config('paypal.live.client_id') && config('paypal.live.client_secret') && config('paypal.live.client_id') !== 'test_client_id')
+                @if(config('habbo.paypal.live.client_id') && config('habbo.paypal.live.client_secret') && config('habbo.paypal.live.client_id') !== 'test_client_id')
                     <form action="{{ route('paypal.process-transaction') }}" method="GET" class="mt-3">
                         @csrf