Build iOS VPN in Swift

The goal is to ship a production-ready VPN client for iPhone and iPad, written entirely in Swift and powered by Apple’s NetworkExtension framework. The app must include a reliable kill switch, let the user move seamlessly between multiple server locations, and automatically reconnect if connectivity drops.

I already have server-side infrastructure; your focus is the native client, a modern and sleek interface, and solid user-name-and-password authentication. Expect to wire up the login, surface the available locations, and expose a single-tap connect experience.

Code needs to be modular, well commented, and fully compatible with the latest Xcode and iOS versions. Please plan on a TestFlight-ready build plus a short hand-off session so I can push it through App Store review without surprises.