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/Http/Controllers/Admin/SubscriberController.php

@@ -95,7 +95,7 @@ class SubscriberController extends Controller
             foreach ($subscribers as $sub) {
                 $row = [$sub->first_name, $sub->last_name, $sub->email];
                 if ($phoneEnabled) {
-                    $row[] = $sub->phone ?? '';
+                    $row[] = $sub->phoneDisplay() ?? '';
                 }
                 $row[] = $sub->created_at?->toDateTimeString() ?? '';
                 $row[] = $sub->synced_to_mailwizz ? 'Yes' : 'No';