feat(subscribe): queue Weeztix coupon, then Mailwizz; document queues

- RegisterSubscriberOnPage: persist subscriber then dispatch integrations
- IssueWeeztixCouponForSubscriber on weeztix queue; dispatches Mailwizz after
  coupon attempt (idempotent if coupon_code already set); failed() fallback
- SyncSubscriberToMailwizz implements ShouldQueueAfterCommit
- Deployment: worker listens weeztix,mailwizz,default; warn against sync in prod
- .env.example: QUEUE_CONNECTION notes for subscribe UX

Made-with: Cursor

app/Jobs/SyncSubscriberToMailwizz.php

@@ -9,7 +9,7 @@ use App\Models\Subscriber;
 use App\Services\MailwizzService;
 use Illuminate\Bus\Queueable;
 use Illuminate\Contracts\Queue\ShouldBeUnique;
-use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Contracts\Queue\ShouldQueueAfterCommit;
 use Illuminate\Foundation\Bus\Dispatchable;
 use Illuminate\Queue\InteractsWithQueue;
 use Illuminate\Queue\SerializesModels;
@@ -17,7 +17,7 @@ use Illuminate\Support\Facades\Log;
 use RuntimeException;
 use Throwable;
 
-class SyncSubscriberToMailwizz implements ShouldBeUnique, ShouldQueue
+class SyncSubscriberToMailwizz implements ShouldBeUnique, ShouldQueueAfterCommit
 {
     use Dispatchable;
     use InteractsWithQueue;