app: remove deprecated swift ffi crate - field_ios - In-the-field app for Radroots on iOS

commit 0ec3178d7eb6e85d5a783f33273d6405dd0a3af5
parent 08e955735a7c80c3acb8316bef0c4c8d5654edfe
Author: triesap <tyson@radroots.org>
Date:   Sat, 28 Feb 2026 20:32:40 +0000

app: remove deprecated swift ffi crate


- remove the app-ffi-swift crate sources from the workspace
- drop `radroots-app-ffi-swift` from workspace dependencies and release/coverage contracts
- renumber coverage rollout ordering after removing the crate entry
- regenerate cargo.lock and validate with cargo check and cargo test

	field_ios In-the-field app for Radroots on iOS git clone https://radroots.dev/git/field_ios.git
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