feat: clean Weeztix and Mailwizz when admin deletes subscriber

Run CleanupSubscriberIntegrationsService before delete: remove coupon code
in Weeztix via list+DELETE API; update Mailwizz contact to strip configured
source tag from the tag field and clear the mapped coupon field.

Extract MailwizzCheckboxlistTags and MailwizzSubscriberFormPayload for
shared sync/cleanup behaviour. Add WeeztixService list and delete helpers.

Integration failures are logged only; local delete always proceeds.
Feature tests cover Mailwizz strip+clear and Weeztix delete paths.

Made-with: Cursor

app/Services/MailwizzSubscriberFormPayload.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services;
+
+use App\Models\MailwizzConfig;
+use App\Models\Subscriber;
+
+/**
+ * Shared Mailwizz list subscriber field payload for create/update (excluding tag merge logic).
+ */
+final class MailwizzSubscriberFormPayload
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public static function baseFields(Subscriber $subscriber, MailwizzConfig $config, bool $phoneEnabled): array
+    {
+        $data = [
+            $config->field_email => $subscriber->email,
+            $config->field_first_name => $subscriber->first_name,
+            $config->field_last_name => $subscriber->last_name,
+        ];
+
+        if ($phoneEnabled && $config->field_phone !== null && $config->field_phone !== '') {
+            $phone = $subscriber->phoneDisplay();
+            if ($phone !== null && $phone !== '') {
+                $data[$config->field_phone] = $phone;
+            }
+        }
+
+        $couponField = $config->field_coupon_code;
+        if (is_string($couponField) && $couponField !== '' && $subscriber->coupon_code !== null && $subscriber->coupon_code !== '') {
+            $data[$couponField] = $subscriber->coupon_code;
+        }
+
+        return $data;
+    }
+}