feat: prepare project for Hugging Face Spaces deploy

Adds the Spaces YAML frontmatter to README and flips the Dockerfile defaults to install the heavy transformer stack and cache HF assets under /tmp so the container works under the Spaces non-root user.

Dockerfile

@@ -8,12 +8,14 @@ RUN npm run build
 
 FROM python:3.12-slim-bookworm
 
-ARG INSTALL_HF=0
+ARG INSTALL_HF=1
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     PYTHONPATH=/app \
     NLTK_DATA=/app/nltk_data \
+    HF_HOME=/tmp/hf_cache \
+    TRANSFORMERS_CACHE=/tmp/hf_cache \
     MODEL_NAME="Meta-Feature Stacking (Production)" \
     ENV=production \
     PORT=8000 \

README.md

@@ -1,3 +1,15 @@
+---
+title: SignalMod
+emoji: 🛡️
+colorFrom: red
+colorTo: yellow
+sdk: docker
+app_port: 8000
+pinned: false
+license: apache-2.0
+short_description: Smart moderation for YouTube comments
+---
+
 <div align="center">
 
 <img src="docs/assets/signalmod_logo.png" alt="SignalMod" width="520" />