feat!: upgrade to Laravel 13 compatibility

- Update laravel/framework to ^13.0, tinker to ^3.0, query-builder to ^7.0
- Migrate User model to #[Fillable] and #[Hidden] attributes (Laravel 13 pattern)
- Add LARAVEL_130 ruleset to Rector configuration
- Add PHP 8.4 to CI test matrix
- Update README badges and description for Laravel 13

BREAKING CHANGE: requires Laravel 13.x, drops Laravel 12 support

rector.php

@@ -21,6 +21,7 @@ return RectorConfig::configure()
         LaravelSetList::LARAVEL_FACTORIES,
         LaravelSetList::LARAVEL_IF_HELPERS,
         LaravelSetList::LARAVEL_LEGACY_FACTORIES_TO_CLASSES,
+        LaravelSetList::LARAVEL_130,
     ])
     ->withImportNames(
         removeUnusedImports: true,