fix: enforce transformers offline mode and limit TF threads to prevent timeouts on HF Spaces

Dockerfile

@@ -18,6 +18,15 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Pre-download HF model to avoid file-lock hangs at runtime on HF Spaces
 RUN python -c "import os; os.environ['TF_CPP_MIN_LOG_LEVEL']='3'; from transformers import pipeline; pipeline('zero-shot-classification', model='typeform/distilbert-base-uncased-mnli', framework='tf')"
 
+# Limit TensorFlow threads to prevent CPU thrashing on Hugging Face Spaces
+ENV OMP_NUM_THREADS=2
+ENV TF_NUM_INTRAOP_THREADS=2
+ENV TF_NUM_INTEROP_THREADS=2
+
+# Set Hugging Face offline mode to prevent network timeouts during inference
+ENV TRANSFORMERS_OFFLINE=1
+ENV HF_HUB_OFFLINE=1
+
 COPY --chown=user:user . /app
 
 # HF Spaces run on port 7860