Backend deployment configuration with environment variable support

[Copilot]

Addressed deployment requirements by configuring backend API for production environments with proper CORS, WebSocket support, and environment-based configuration.

Changes

• Environment configuration: API endpoints now use process.env.API_URL instead of hardcoded localhost URLs in auth and homepage scripts
• CORS setup: Enhanced CORS configuration with credentials support and configurable origin from environment variables
• WebSocket integration: Added Socket.IO for real-time communication capabilities
• Server refactoring: Restructured server initialization with proper port configuration from environment variables
• Dependencies: Updated package.json with socket.io and socket.io-client

Configuration

// API calls now use environment-aware base URL
const API_URL = process.env.API_URL || 'http://localhost:3000';
fetch(`${API_URL}/api/endpoint`, { credentials: 'include' });

Server port defaults to process.env.PORT || 3000 for flexible deployment across hosting platforms.

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