Summary

This PR adds Groq as a first-class LLM provider across the project.

What changed

• added Groq runtime config in services/llm.py
• added Groq health-check support
• added Groq model listing support for CLI
• updated CLI provider selection and interactive wizard in desysflow_cli/__main__.py
• updated UI fallback provider list in ui/src/App.jsx
• updated API/schema descriptions in schemas/models.py
• updated .env.example and docs to mention Groq

Why

The project already supported OpenAI, Anthropic, and Ollama. This change adds Groq so users can choose Groq-hosted models and select them from the CLI flow.

Testing

• tested scripts/check_model.py with Groq config
• tested CLI Groq provider selection flow
• tested Groq model selection in interactive CLI
• tested UI provider configuration flow
• confirmed generated .desysflow artifacts are gitignored and cleaned after testing

Notes

• Groq uses the OpenAI-compatible API base URL: https://api.groq.com/openai/v1
• CLI falls back to manual model entry if Groq model listing is unavailable