fix: upgrade Gradio to 6.14.0 in README.md and requirements.txt to solve Jinja2 unhashable dict TypeError

fix: resolve Hugging Face Spaces connection ValueError and Jinja2 serialization crash

fix: pin huggingface_hub<1.0.0 to resolve HfFolder import error in Gradio 4

feat: 프로젝트 초기 구성 및 GraphRAG 테스트 파이프라인 연동