Fix VideoTile bug and improve screen sharing

README.md

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+# Meet Server
+
+The high-performance signaling and media relay server for the Meet application. Built with **Rust**, **Axum**, and **Tokio**.
+
+## Features
+- **Signaling**: WebSocket-based room management and peer discovery.
+- **Media Relay**: Custom UDP protocol for low-latency video and screen sharing.
+- **Architecture**: Asynchronous, localized state management using `DashMap`.
+
+## Prerequisites
+- **Rust**: Latest stable version. Install via [rustup.rs](https://rustup.rs).
+- **Build Tools**: `build-essential` (Ubuntu) or `Development Tools` group (Fedora/RHEL).
+
+## Installation
+
+1.  **Clone the Repository**:
+    ```bash
+    git clone <your-server-repo-url>
+    cd server
+    ```
+
+2.  **Verify Shared Crate**:
+    Ensure the `shared` directory exists in the root. This contains protocol definitions used by both client (logic port) and server.
+    ```bash
+    ls -F shared/
+    ```
+
+3.  **Build**:
+    ```bash
+    cargo build --release
+    ```
+    The binary will be located at `target/release/server`.
+
+## Running the Server
+
+### Ports
+- **TCP/WebSocket**: 6000 (Bind: `0.0.0.0:6000`)
+- **UDP (Media)**: 4000 (Bind: `0.0.0.0:4000`)
+
+### Local Development
+```bash
+cargo run
+```
+Runs on `0.0.0.0:6000` (HTTP/WS) and `0.0.0.0:4000` (UDP).
+
+### Production Deployment
+1.  **Run the Binary**:
+    ```bash
+    ./target/release/server
+    ```
+2.  **Firewall**:
+    Ensure **TCP 6000** and **UDP 4000** are open.
+    ```bash
+    # Fedora/CentOS
+    sudo firewall-cmd --add-port=6000/tcp --permanent
+    sudo firewall-cmd --add-port=4000/udp --permanent
+    sudo firewall-cmd --reload
+
+    # Ubuntu/Debian (UFW)
+    sudo ufw allow 6000/tcp
+    sudo ufw allow 4000/udp
+    ```
+3.  **Systemd (Optional)**:
+    Create a service file `/etc/systemd/system/meet-server.service` to keep it running.
+
+## Project Structure
+- `src/main.rs`: Entry point. Sets up Axum router and spawns the UDP listener.
+- `src/handlers.rs`: WebSocket handlers for joining rooms, signaling, and chat.
+- `src/udp.rs`: The core UDP packet handling loop. Manages media relaying.
+- `src/state.rs`: Shared application state (Rooms, Peers).
+- `shared/`: Local crate containing shared data structures (`Packet` headers, `MediaType` enums).