HTTP/WebSocket gateway with authentication, rate limiting, and webhook support.

This crate provides the public-facing server that accepts HTTP and WebSocket connections, applies authentication and rate-limiting middleware, and routes requests to the agent runner.

Main types

• [GatewayServer] — Builds and starts the Axum-based HTTP/WS server.
• [AuthConfig] — API-key authentication configuration.
• [ConnectionManager] — Tracks active WebSocket connections.
• [MessageRouter] — Routes inbound messages to the appropriate handler.