Add llm-box: terminal-first AI workflow engine

[alib8b8]

Hi! I'd like to suggest adding llm-box - a terminal-first AI workflow engine with:

• Beautiful TUI built with Bubble Tea
• YAML-defined LLM pipelines
• 15+ model providers (DeepSeek, GLM, Kimi, Qwen, InternLM, Ollama, etc.)
• Multi-language plugin support
• Built-in expression engine, condition nodes, and execution history

Thanks for maintaining this awesome list!