Refactor app.py to improve model loading and PDF processing; update dataset generation logic and enhance UI components

Refactor Hugging Face integration to use HuggingFaceEndpoint; update requirements.txt for dependency alignment

Enhance README with supported tasks and schemas; update app.py for task templates and localization; modify requirements.txt for additional dependencies

Implement Hugging Face OAuth login requirement; update README for usage instructions

Add login functionality with Hugging Face OAuth; enable/disable Generate button based on login state

Enhance README and app.py for PDF to QA dataset generation; add requirements.txt

Add initial implementation of Gradio interface for greeting users