Replace header text "Payment Plugin for ThinkAdmin" with "ThinkAdmin Plugin for ThinkAdmin" across project files (configs, controllers, plugins, php-cs-fixer, etc.) to unify branding. Add a new composer script "rewrite-model" to regenerate models and run php-cs-fixer. Also apply a minor newline fix in .copilot-commit-message-instructions.md.
Add PHP CS Fixer configuration (.php-cs-fixer.php) to enforce coding style and apply corresponding updates across the codebase. Numerous plugins (think-library and many think-plugs-*) and core config files (cache, database, phinx, worker) were updated along with controllers, services, models, storage adapters, helpers and tests to conform to style fixes and minor compatibility/refactors.
