Fix: handle numpy labels correctly for small HF demo datasets

HF fix: default to sample dataset for reproducible Space demo

Fix: include training_utils module for HF Space runtime

Phase 1: Offline NIDS prototype with CV, threshold tuning

Delete src/streamlit_app.py

Delete requirements.txt

Delete README.md

Delete .gitattributes

initial commit

Duplicate from streamlit/streamlit-template-space