hf: update Dockerfile & supervisord to point to q8_0.gguf model

fix: pull model from models/

fix: register llama shared libs with ldconfig and LD_LIBRARY_PATH

fix: keep llama-server binary and backend .so files together

fix: correct llama-server binary path in Space Dockerfile

enh: Add HF spaces support with all-in-one Dockerfile

enh: Add docker compose file to host llama server, fastapi app & streamlit together