seetherisingazeez/airpass ? reverse-engineered prompt

Build me a Flutter package called Airpass that lets devices share messages without internet using nearby Bluetooth and Wi Fi Direct connections.

I want the app to work like a store and forward mesh, where messages are saved locally first, then briefly synced to nearby devices, and dropped as soon as the transfer is done. Please include a simple client API for subscribing to groups, sending messages, watching for discovered groups, and listening for incoming messages, plus a local database so the UI only reads and writes locally.

Also set up permissions and hardware checks for Bluetooth and Wi Fi, and add a background service that can run on Android and the best possible background behavior on iOS. It should support a service locator setup before the app starts, and be usable from a basic example Flutter app.

If you need current Flutter or platform docs, look them up online and follow the latest guidance.