Ideas, in themselves, are worth usually nothing, as long as they are kept strictly in the mind of the person who generated the said ideas.
Therefore, it is totally inappropriate to mention these in your CV, since you are not willing to talk about it anyway.
For the best outcome, just mention in the CV the information you already have and that you can talk about, and which helps you sell yourself for the highest price.
Once you have the startup ready, you will plan new strategies on how to handle the 9-to-5 job in parallel with the startup, or how you should make changes graciously.
You might mention during the interview that you work on some personal projects at home, and that might interfere slightly with your employment, e.g. you might not be able to do overtime on a short time's notice. If they ask about details, you may limit yourself saying the generic stuff, e.g.:
"I develop a web-based platform for offering services to (albino panda bears). When it will reach a more mature stage, I will feel more comfortable to talk about it."
Just be careful not to hurt your chances of employment if you show too much involvement in your own personal projects.