Feature: Add WebSocket connection proxy

[AkashBhuiyan]

Description

Add support for WebSocket connections through the backend.

Requirements

• Establish WebSocket connection to target server
• Relay messages between client and server
• Support custom headers in handshake
• Connection status updates
• Message history
• Graceful disconnect

API Design

WebSocket: /api/v1/ws/proxy?url=wss://target.com/socket

Messages:
→ {"type": "send", "data": "Hello"}
← {"type": "receive", "data": "World"}
← {"type": "status", "connected": true}

Labels

enhancement, feature