upgrade to Laravel 11|12

• upgrade to Laravel 11|12 and Intervention Image v3
• add GitHub Actions workflow for Laravel 11 and 12 testing -
• added comprehensive GitHub Actions workflow with test matrix for PHP 8.2, Laravel 11/12, including code sniffing and unit tests
• migrate from laravelcollective/html to spatie/laravel-html
• fix formatting and import order issues
• bug fixes
• improve installation instructions
• remove Scrutinizer CI configuration