Add ability to start and stop server as a background daemon

[Alirexaa]

Feature: Chico Server Daemon

Add a new command chico start to start the Chico server in the background (daemon mode), allowing the current shell to remain unblocked.

Requirements

• Implement chico start to launch the server as a background process.
• Ensure the process does not block the user's shell.
• Provide a command chico stop to gracefully terminate the background server process.

Motivation

Running the server in the background is useful for development and production scenarios where users want to continue using their shell.

Acceptance Criteria

• chico start launches the server as a daemon.
• chico stop terminates only the server started by chico start.
• Add documentation for both commands.