Fix Method Not Allowed: move static mount to end of main.py and use root-relative ASR base in config.js

Fix typo: os.path.absolute -> os.path.abspath

Optimize build: use CPU torch index and fix invalid versions

Restore Dashboard as main app: serve frontend from FastAPI, add Dockerfile, remove Streamlit entry point

Deployment ready: cleaned secrets and fixed HF metadata

feat: add Next.js frontend and FastAPI backend with JWT auth and modular structure