Dockerfile

FROM python:3.9-slim

# Set working directory
WORKDIR /app

# Copy all backend files
COPY . .

# Install dependencies
RUN pip install --no-cache-dir --upgrade -r requirements.txt

# Run with gunicorn (Flask app inside app.py, object name = sales_forecast_api)
CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:7860", "app:sales_forecast_api"]