add docker

backend/Dockerfile

@@ -0,0 +1,15 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+COPY requirements-backend.txt /app/requirements-backend.txt
+RUN pip install --no-cache-dir -r /app/requirements-backend.txt
+
+COPY backend/ /app/backend/
+
+EXPOSE 8000
+
+CMD ["python", "-m", "uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "8000"]