chore(repo): establish isolated mobile repository and upstream audit

README.md

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+# Yuvomi Mobile
+
+Independent, community-maintained Android (Kotlin/WebView) and iOS
+(SwiftUI/WKWebView) companions for user-owned [Yuvomi](https://github.com/ulsklyc/yuvomi)
+servers. Not affiliated with or endorsed by upstream.
+
+**Development build - not production-ready.** See [validation status](docs/validation.md).
+No mobile backend, advertisements, telemetry, tracking, subscriptions, or mandatory cloud.
+The configured server supplies the application and retains responsibility for its own
+integrations, version checks, security and privacy.
+
+Use a root-hosted HTTPS instance with a valid certificate, including private servers
+accessible through your VPN. Custom ports are supported. HTTP and subpath deployments
+are intentionally rejected. Enter the server on first launch; use Server settings to
+reconnect or erase local browsing data and switch installations.
+
+- [Architecture](docs/architecture.md)
+- [Android build](docs/build-android.md) / [iOS build](docs/build-ios.md)
+- [Compatibility and authentication](docs/server-compatibility.md)
+- [Release process](docs/release-process.md)
+
+MIT licensed. Upstream notices are preserved in `THIRD_PARTY_NOTICES.md`.
+This implementation is AI-assisted (OpenAI via OpenCode) and requires human security
+review before release. No upstream modification or public submission is authorized.