Fix model cache permissions

Dockerfile

@@ -2,6 +2,12 @@ FROM python:3.10-slim
 WORKDIR /app
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
+
 COPY app.py .
+
+# Hugging Face model cache
+RUN mkdir -p /app/cache
+ENV TRANSFORMERS_CACHE=/app/cache
+
 EXPOSE 7860
 CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]