Create dockerfile

dockerfile

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+FROM python:3.10-slim
+
+# System libs for OpenCV/ONNX
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg libsm6 libxext6 libglib2.0-0 libgl1 && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy app + models
+COPY . .
+
+# Hugging Face Spaces expect you to bind to $PORT
+ENV PORT=7860
+EXPOSE 7860
+
+# Run Flask via gunicorn
+CMD ["gunicorn", "-w", "1", "-k", "gthread", "--threads", "8", "-b", "0.0.0.0:7860", "app:app"]