Fix Dockerfile - remove datasets copy (now using HF Dataset)

Dockerfile

@@ -16,7 +16,7 @@ COPY app.py .
 COPY templates/ templates/
 COPY static/ static/
 COPY src/ src/
-COPY datasets/ datasets/
+# Note: datasets are now downloaded from HF Dataset at runtime
 
 # Create directories
 RUN mkdir -p outputs .cache/datasets