It’s tricky as at the moment there doesn’t appear to be a course of action with a happy outcome in the near future. The options I see are:

1) to stand up to your mother and take a more independent position in your life which hopefully in the long term will make her respect your grown and have a right to make your own choice.

Spying on you is a big issue, as it shows she isn’t trusting you let alone valuing your right to have autonomy and while the cameras are still there this will not stop. You also have to weigh up how far this influence on your life will go, as it could lead to her trying to exert more control over your life in future.

2) accept your mother’s wishes. It will keep the family peace but you’ll lose the boyfriend and also be giving up your autonomy as it’ll likely lead to her taking a more active role in your life and what you do, supported by the fact she can use the cameras to monitor you.

Regardless I think providing you feel able you ought to try to take some independence from her and set boundaries. It’s not going to be easy but in either case this seems the biggest issue.