datawisehk/mai-displayads-sample ? reverse-engineered prompt

I want you to update this sample app so it works with my own display ads setup.

Please make the Android and iOS demo screens use the right display endpoint, tracking endpoint, and ad unit identifier, and wire those values into the places the README points to. I mainly want the sample to be easy to run and to show banners and splash ads correctly with the new config.

Please check the existing demo screens and make the smallest clean changes needed so the sample still feels like a working reference app. If anything is unclear, look up the current docs online and use sensible defaults where needed.

After that, make sure the sample builds cleanly on both platforms and the example screens still behave like a simple SDK demo that someone can open and test right away.