add Dockerfile for HF Spaces deployment

Dockerfile

@@ -0,0 +1,20 @@
+FROM python:3.12-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends curl && \
+    curl -fsSL https://deb.nodesource.com/setup_20.x | bash - && \
+    apt-get install -y --no-install-recommends nodejs && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY storage/package.json storage/package-lock.json* storage/
+RUN cd storage && npm install --production 2>/dev/null || true
+
+COPY . .
+
+EXPOSE 7860
+
+CMD ["python", "-m", "uvicorn", "server.api:app", "--host", "0.0.0.0", "--port", "7860"]