feat: E.164 phone validation and storage with libphonenumber

- Add giggsey/libphonenumber-for-php, PhoneNumberNormalizer, ValidPhoneNumber rule

- Store subscribers as E.164; mutator normalizes on save; optional phone required from form block

- Migration to normalize legacy subscriber phones; Mailwizz/search/UI/tests updated

- Add run-deploy-from-local.sh and PREREGISTER_DEFAULT_PHONE_REGION in .env.example

Made-with: Cursor

app/Models/PreregistrationPage.php

@@ -108,6 +108,19 @@ class PreregistrationPage extends Model
         return (bool) $this->phone_enabled;
     }
 
+    /**
+     * When the form block marks the phone field as required (only applies if phone is enabled).
+     */
+    public function isPhoneFieldRequiredForSubscribers(): bool
+    {
+        $form = $this->getBlockByType('form');
+        if ($form !== null) {
+            return (bool) data_get($form->content, 'fields.phone.required', false);
+        }
+
+        return false;
+    }
+
     public function headlineForMeta(): string
     {
         $hero = $this->getHeroBlock();