Add SwiftUI iOS app shell

apps/ios/TeleTuiIOS/README.md

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+# TeleTuiIOS
+
+Native SwiftUI shell for the iOS client.
+
+Current scope:
+
+- SwiftUI + MVVM app shell backed by a deterministic fake bridge.
+- Auth, chat list, folder selector, chat detail, compose bar, profile sheet, and account switcher shell.
+- iOS-oriented storage boundaries: Keychain-shaped credential API and Application Support account paths.
+
+Build and smoke-test the portable shell:
+
+```bash
+cd apps/ios/TeleTuiIOS
+swift run TeleTuiIOSSmokeTests
+```
+
+Simulator/device build is currently blocked on this machine because `xcodebuild -version` fails with:
+
+```text
+xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
+```