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/Rules/ValidPhoneNumber.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Rules;
+
+use App\Services\PhoneNumberNormalizer;
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+final class ValidPhoneNumber implements ValidationRule
+{
+    public function __construct(
+        private readonly PhoneNumberNormalizer $normalizer
+    ) {}
+
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if ($value === null || $value === '') {
+            return;
+        }
+
+        if (! is_string($value)) {
+            $fail(__('Please enter a valid phone number.'));
+
+            return;
+        }
+
+        if ($this->normalizer->normalizeToE164(trim($value)) === null) {
+            $fail(__('Please enter a valid phone number.'));
+        }
+    }
+}