* Add support for Telegram Bot API 9.1 features, including checklists, gifts, and new methods like `SendChecklist`, `EditMessageChecklist`, and `GetMyStarBalance`. Update changelog and improve `True` field descriptions.
* Bump API Version
* Refactor profile photo types to use `InputProfilePhotoType` enums instead of hardcoded literals
* Refactor imports and clean up redundant code across methods, types, and webhook server classes
