[system] Add system queue list watch flag

[brileyyyy]

Description

Implements real-time queue monitoring functionality for the d8 system queue list command using the --watch/-w flag. The implementation replaces legacy system-dependent screen clearing with modern cross-platform terminal control using the termenv library.

Features

• Real-time monitoring: Watch queue changes with automatic updates every second
• Graceful shutdown: Clean exit with Ctrl+C signal handling
• Backward compatibility: Existing commands work unchanged

Core Changes

• Added --watch/-w flag support
• Refactored queue operations
• Modern terminal handling

Usage Examples

# View queues once (existing behavior)
d8 system queue list

# Watch queues in real-time (new feature)
d8 system queue list --watch
d8 system queue list -w

# Watch with other options
d8 system queue list --watch --output text
d8 system queue list -w --show-empty