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

tests/Feature/PublicPageTest.php

@@ -170,7 +170,7 @@ class PublicPageTest extends TestCase
         $response->assertJsonValidationErrors(['phone']);
     }
 
-    public function test_subscribe_normalizes_phone_to_digits(): void
+    public function test_subscribe_stores_phone_as_e164(): void
     {
         $page = $this->makePage([
             'start_date' => now()->subHour(),
@@ -189,7 +189,7 @@ class PublicPageTest extends TestCase
         $this->assertDatabaseHas('subscribers', [
             'preregistration_page_id' => $page->id,
             'email' => 'phoneuser@example.com',
-            'phone' => '31612345678',
+            'phone' => '+31612345678',
         ]);
     }