Remove old UIKit boilerplate and unused files

- Delete old KeepMeFit/ folder with UIKit files (AppDelegate, SceneDelegate, ViewController)
- Remove Podfile (not using CocoaPods)
- Remove notes.txt
- Remove unused ContentView.swift

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: anubhavtyagi27