Convert project to Rust web server with Actix-web

[933942-a11y]

Overview

This PR converts the shuttle-lite project from a Node.js/Fastify implementation to a modern Rust web server using the Actix-web framework.

Changes

• Renamed project from shuttle-lite to rust-web to better reflect the new technology stack
• Replaced Node.js/Fastify with Rust/Actix-web for better performance and type safety
• Added Cargo.toml with essential dependencies:
  • actix-web v4 for the web framework
  • tokio for async runtime
  • reqwest for HTTP client functionality
• Implemented reverse proxy in src/main.rs that proxies requests to https://pr.shuttleproxy.com
• Updated README.md with Rust build and run instructions
• Updated package.json to reflect the new project structure

Benefits

• Improved performance through compiled Rust code
• Type-safe implementation with Rust's type system
• Better error handling with Rust's Result types
• Maintained proxy functionality with modern async/await patterns

How to Test

# Build the project
cargo build --release

# Run the server
cargo run

The server will listen on 0.0.0.0:3000 and proxy requests to https://pr.shuttleproxy.com