Add beautiful English main page with JANGG AI API branding and endpoint documentation

Resolve Dockerfile conflict with port 7860 and main.py configuration

Fix Hugging Face Spaces: add main.py at root and change port to 7860

Update Dockerfile

Fix pydantic validation: use Optional[str] for API keys to make them truly optional

Fix Pydantic v2 compatibility: use model_config instead of Config class

Fix missing environment variables: make GROQ_API_KEY optional and set defaults in Dockerfile

Resolve requirements.txt conflict with flexible versions

Fix Docker build issues: add setuptools/wheel and use flexible version requirements

Update requirements.txt

Resolve merge conflicts and integrate Hugging Face Space changes

Add README and fix Dockerfile for Hugging Face Spaces deployment

clean initial commit

fastapi hf v0