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/Providers/AppServiceProvider.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\Providers;
 
 use App\Models\PreregistrationPage;
+use App\Services\PhoneNumberNormalizer;
 use Illuminate\Pagination\Paginator;
 use Illuminate\Support\Facades\Route;
 use Illuminate\Support\ServiceProvider;
@@ -16,7 +17,11 @@ class AppServiceProvider extends ServiceProvider
      */
     public function register(): void
     {
-        //
+        $this->app->singleton(PhoneNumberNormalizer::class, function (): PhoneNumberNormalizer {
+            return new PhoneNumberNormalizer(
+                (string) config('preregister.default_phone_region', 'NL')
+            );
+        });
     }
 
     /**