I’m looking for a straightforward MVP that lets two people video-call and share their screens on iPhone, iPad, and Android. No chat, no group rooms—just a clean one-to-one connection that “just works.” You should be able to see both the sending and receiving User at all times. Core needs • Stable two-way video and audio on all three platforms. • Either participant can start or stop screen sharing at any time, and the other party immediately sees the shared screen. • Email-and-password sign-up / log-in only; no social or phone auth. • A basic session-timeout safeguard so an idle user is automatically logged out after a set period. • One simple “standard user” role—no admin panels or extra permission tiers right now. Should be built in.net C# Maui Zero-cost infrastructure I want to avoid recurring fees, so please compare free options such as WebRTC, Jitsi, or any other no-cost SDK/API you trust. If none meet the requirement, propose a lightweight self-hosted signaling server I can spin up cheaply (e.g., Node, Go, or Python on a small VPS). SQL server is available. Deliverables 1. Working source code for iOS and Android (native, Flutter, React Native, or similar—your call as long as it passes App Store / Play Store review). 2. Build/run instructions and minimal technical notes describing the video stack, screen-share implementation, and timeout flow. 3. A brief outline of how the chosen solution stays free at scale and what trade-offs exist. Keep the UI minimal: a login screen, a simple “call” screen with buttons for video, mic, screen share, and hang up. Once this lean prototype is stable, we can discuss future iterations, but for now the goal is a basic, reliable proof of concept.