Add Dockerfile for HF Space

Dockerfile

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+FROM node:20 AS frontend
+WORKDIR /app
+COPY frontend/package*.json frontend/
+RUN cd frontend && npm ci
+COPY frontend frontend
+RUN cd frontend && npm run build
+
+FROM python:3.11-slim
+WORKDIR /app
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+ENV FRONTEND_BASE_URL=http://localhost:7860
+
+COPY server/requirements.txt server/requirements.txt
+RUN pip install --no-cache-dir -r server/requirements.txt \
+    && python -m playwright install chromium --with-deps
+
+COPY server server
+COPY --from=frontend /app/frontend/dist frontend/dist
+
+EXPOSE 7860
+CMD ["uvicorn","server.app.main:app","--host","0.0.0.0","--port","7860"]