Read bound address from server.address() and handle IPv6 formatting

[Copilot]

The HttpServer was hardcoding 127.0.0.1 for the endpoint URL instead of reading the actual bound address, and lacked IPv6 support.

Changes

• Read actual bound address: Extract IP and port from server.address() instead of assuming hardcoded values
• IPv6 bracket notation: Format IPv6 addresses as [address]:port, IPv4 as address:port
• Bind to 'localhost': Changed from '127.0.0.1' to allow system DNS resolution to choose IPv4 (127.0.0.1) or IPv6 (::1) loopback
• Type safety: Import AddressInfo from node:net, add guards for null and string pipe paths
• Extract formatAddress() helper: Centralize formatting logic with proper IPv6 detection

// Before
const endpoint = `ws://${LOCALHOST_IP}:${this._listeningPort}`;

// After
const addressInfo = this._server.address();
const formattedAddress = formatAddress(addressInfo); // Handles IPv4/IPv6
const endpoint = `ws://${formattedAddress}`;

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