CLI tool that displays network speed test results from
Cloudflare's speed test service in a TUI interface.

Features:
 - Speed Tests: Measures download/upload throughput,
   idle latency, and loaded latency
 - Interactive TUI: Real-time charts and statistics
 - History: View and manage past test results
 - Export: Save results as JSON
 - Text/JSON Modes: Headless operation for scripting
 - Interface Binding: Bind to specific network interface or source IP
