feat(ios): add ClawdisNode app scaffold

apps/ios/README.md

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+# ClawdisNode (iOS)
+
+Internal-only SwiftUI app scaffold.
+
+## Lint/format (required)
+```bash
+brew install swiftformat swiftlint
+```
+
+## Generate the Xcode project
+```bash
+cd apps/ios
+xcodegen generate
+open ClawdisNode.xcodeproj
+```
+
+## Shared packages
+- `../shared/ClawdisNodeKit` — shared types/constants used by iOS (and later macOS bridge + gateway routing).