- Add support for shared/top‑level router parameters (dependencies, tags, callbacks, default response class, etc.) in APIRouter and include_router, enabling configuration closer to the code.
- Introduce breaking changes: tag order in OpenAPI output is revised and default response class now uses an internal DefaultPlaceholder, affecting advanced custom response handling.
- Update and expand documentation, fixing typos, adding new tutorials, translations, and external links; also include minor internal and sponsor updates.