Update Dockerfile

Dockerfile

@@ -36,8 +36,8 @@ RUN pip install -r requirements.txt || pip install -r backend/requirements.txt |
 # Install runtime dependencies explicitly
 RUN pip install --no-cache-dir fastapi uvicorn python-multipart ultralytics opencv-python-headless pillow numpy scikit-learn tensorflow keras
 
-# Hugging Face Spaces expect port 7860
+# Hugging Face Spaces sets PORT (default 7860). Listen on $PORT for compatibility.
 EXPOSE 7860
 
-# Run FastAPI app
-CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]
+# Run FastAPI app (respect PORT env var if set by the platform)
+CMD ["sh", "-c", "uvicorn app:app --host 0.0.0.0 --port ${PORT:-7860}"]