Invalidate Docker cache to force fresh app.py copy

- Add cache-busting comment to ensure HF Spaces rebuilds with latest code

Dockerfile

@@ -24,5 +24,6 @@ COPY app.py .
 # RUN python -c "from huggingface_hub import hf_hub_download; hf_hub_download(repo_id='unsloth/Qwen3-0.6B-GGUF', filename='Qwen3-0.6B-Q4_K_M.gguf', local_dir='./models')"
 
 EXPOSE 7860
+# Cache bust: 2026-02-01-v1
 
 CMD ["python", "app.py"]