refactor Dockerfile: update CMD to ENTRYPOINT and remove packages.txt

Dockerfile

@@ -42,16 +42,16 @@ FROM ${BASE_IMAGE}
 
 WORKDIR /app
 
-# venv copied to the SAME path it was built at — shebangs stay valid
 COPY --from=builder /app/env/.venv /app/env/.venv
 COPY --from=builder /app/env /app/env
 COPY --from=builder /root/nltk_data /root/nltk_data
 
-# PATH updated to match
 ENV PATH="/app/env/.venv/bin:$PATH"
 ENV PYTHONPATH="/app/env:$PYTHONPATH"
 
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
     CMD curl -f http://localhost:7860/health || exit 1
 
-CMD ["sh", "-c", "cd /app/env && uvicorn server.app:app --host 0.0.0.0 --port 7860"]
+ENTRYPOINT []
+CMD ["/app/env/.venv/bin/uvicorn", "server.app:app", \
+     "--host", "0.0.0.0", "--port", "7860", "--app-dir", "/app/env"]