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

.github/workflows/tests.yml

@@ -12,6 +12,10 @@ jobs:
   ci:
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        php-version: ['8.3', '8.4']
+
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -19,7 +23,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 8.3
+          php-version: ${{ matrix.php-version }}
           tools: composer:v2
           coverage: xdebug