Create Bun WebSocket server

[superposition]

Description

Build the real-time data server using Bun.

Tasks

• Create packages/server/ directory
• Set up Bun.serve with WebSocket upgrade
• Implement binary frame protocol from src/ipc/protocol.ts
• Handle client connections/disconnections
• Implement message broadcasting
• Add connection heartbeat (ping/pong)
• Add basic rate limiting
• Handle authentication (optional API key)

Reference

• src/ipc/protocol.ts - existing message types
• src/ipc/frame.ts - binary frame encoding

Acceptance Criteria

• Server accepts WebSocket connections
• Can send/receive binary frames
• Handles multiple clients

Labels

web-app, backend, server