Provide a switch to let users choose whether to enable the texkeys function

[u7978428]

Provides a switch for users to choose whether to enable the texkeys function, and provides an interface

[Junqi597]

Overall, this is a well-structured and consistent addition.
The new Prefer INSPIRE texkeys option is correctly integrated across the UI, ViewModel, and preferences layers, maintaining JabRef’s clean MVVM architecture. The binding logic and persistence flow look solid.