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

composer.json

@@ -7,6 +7,7 @@
     "license": "MIT",
     "require": {
         "php": "^8.3",
+        "giggsey/libphonenumber-for-php": "^9.0",
         "laravel/framework": "^13.0",
         "laravel/tinker": "^3.0"
     },