refactor(opencode): extends mimo models from xiaomi provider

[juls0730]

opencode zen breakout commit of #1631

Notes

• Context limit changes: A number of models have had their context windows changed. This is because of incorrectly rounded context windows in the xiaomi root provider.
• MiMo V2 Pro limit changes: this carries the same issue of incorrectly rounded numbers in the root provider. Furthermore, I believe the output limit must be listed incorrectly because V2 pro is not open weight and Xiaomi therefore can be the only provider and must have the same limits (I think??)

[juls0730]

blindly accepting supermaven auto suggestions and its consequences