Possibility to run defer tasks after response #168

Implement the ability to register and execute callbacks that run after the HTTP response is sent to the client, without blocking the request lifecycle.

This allows long-running or non-essential tasks (e.g. logging, sending emails, dispatching events) to be deferred, improving response time and user experience.

Acceptance Criteria:

• Introduce a new internal hook named after_response (or similar).

• Allow developers to register callbacks using HookManager::on('after_response', callable).

• Ensure multiple parts of the codebase can register deferred tasks safely.

• Execute all deferred callbacks after $response->send() in the lifecycle.

• Wrap execution in try/catch to prevent deferred task failures from affecting app behavior.

• Add config entry for after_response hook (optional, or register programmatically).