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/Unit/SubscriberPhoneDisplayTest.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit;
+
+use App\Models\Subscriber;
+use Tests\TestCase;
+
+class SubscriberPhoneDisplayTest extends TestCase
+{
+    public function test_phone_display_keeps_e164_with_plus(): void
+    {
+        $subscriber = new Subscriber(['phone' => '+31613210095']);
+        $this->assertSame('+31613210095', $subscriber->phoneDisplay());
+    }
+
+    public function test_phone_display_prefixes_plus_for_legacy_digit_only_storage(): void
+    {
+        $subscriber = new Subscriber(['phone' => '31613210095']);
+        $this->assertSame('+31613210095', $subscriber->phoneDisplay());
+    }
+
+    public function test_phone_display_returns_null_when_empty(): void
+    {
+        $subscriber = new Subscriber(['phone' => null]);
+        $this->assertNull($subscriber->phoneDisplay());
+    }
+}