feat: add Weeztix OAuth, coupon codes, and Mailwizz mapping

Implement Weeztix integration per documentation: database config and
subscriber coupon_code, OAuth redirect/callback, admin setup UI with
company/coupon selection via AJAX, synchronous coupon creation on public
subscribe with duplicate and rate-limit handling, Mailwizz field mapping
for coupon codes, subscriber table and CSV export, and connection hint
on the pages list.

Made-with: Cursor

resources/views/admin/pages/edit.blade.php

@@ -13,8 +13,9 @@
                 {{ __('Public URL') }}: <a href="{{ route('public.page', ['publicPage' => $page]) }}" class="text-indigo-600 hover:underline" target="_blank" rel="noopener">{{ url('/r/'.$page->slug) }}</a>
             </p>
             @can('update', $page)
-                <p class="mt-3">
+                <p class="mt-3 flex flex-wrap gap-x-4 gap-y-1">
                     <a href="{{ route('admin.pages.mailwizz.edit', $page) }}" class="text-sm font-medium text-indigo-600 hover:text-indigo-500">{{ __('Mailwizz integration') }} →</a>
+                    <a href="{{ route('admin.pages.weeztix.edit', $page) }}" class="text-sm font-medium text-indigo-600 hover:text-indigo-500">{{ __('Weeztix integration') }} →</a>
                 </p>
             @endcan
         </div>