qCRM on iOS (third iOS app): a native business app over its edge API #2884

Part of #2875. After Hippo Tycoon on iOS. The real-world business test.

• SwiftUI lists and forms over qCRM's edge API, with its Rust wasm crate built as an xcframework for any logic shared with the web.
• Sign in through eqosys, with account deletion (see the eqosys issue).
• Check first: qCRM is QNTBR-licensed, and a move to a private repo is pending. Decide with the owner whether ios/ lives here or in the private repo before writing it.