Merge main updates into huggingface-space-deployment

Replace AIOrchestrator with LiteLLM Router for multi-provider fallback

feat: replace Gemini with OpenRouter as fallback AI provider

feat: replace Hugging Face with Gemini as fallback AI provider

route group message extraction through AIOrchestrator for HuggingFace fallback on Groq rate limits

support unregistered drivers from group messages and warm new user onboarding

first commit