Module port 

Port management for the microsandbox server.

This module handles port assignment and management for sandboxes:

• Assigns truly available ports obtained from the OS
• Tracks assigned ports for fast lookup
• Persists port assignments to disk
• Loads existing port assignments on startup
• Handles port uniqueness with bidirectional mapping

The module provides:

• Port manager for tracking assigned ports
• Functions for assigning and releasing ports
• File-based persistence of port assignments

Structs

BiPortMapping

Port mapping for sandbox instances - bidirectional for fast lookups

PortManager

Port manager for handling sandbox port assignments

PortMapping

Serializable version of the port mapping for file storage

Constants

LOCALHOST_IP

The localhost IP address used for all portal connections