Implement Dynamic Port Binding

[she3o]

Feature Overview

Allow Zync to bind to dynamically assigned ports,
avoiding port conflicts in environments with multiple services.

Requirements

• If port is specified and unavailable, produce an error and explain to the user.
• if port is not specified, bind to default. If unavailable, bind to another available.
• Provide feedback to the user about the port being used.
• Optionally allow specifying a range of ports to attempt binding.

Acceptance Criteria

• If the default port (4918) is unavailable, the server automatically selects the next available port.
• The chosen port is logged and displayed to the user upon server startup.
• Users can specify a port range or fallback strategy via command-line arguments.