altstoreio/AltStore ? reverse-engineered prompt

Build me a working AltStore style app store for iPhone and Mac that lets a user sideload iPA apps with their Apple ID, install them over Wi Fi through a desktop companion app, and keep them refreshed so they do not expire. I want the iPhone app to show the installed apps and any updates available, handle signing and installing, and let the user manage refreshes in the background when they are on the same network as the Mac app. I also want the macOS companion app to help with the install flow and communicate with the phone on the local network. Please keep it polished, simple to use, and make sure it works with the existing project structure here. If anything is unclear, check the current docs online and then fill in the missing pieces in a practical way.