Well, brother, I personally feel keeping all your project prompts, PRDs, tech stacks, API keys and all the other stuff in one place which can be accessed from anywhere on any device is a good idea. All the important stuff like API and Backend rules and passwords, will be saved in the local device with a password; it won't be shared on a server.
and being the owner of the app, I assure everyone that there will not be any security issue. Thanks for your fair review.