feat: add stage 0 foundation

infra/backend.Dockerfile

@@ -0,0 +1,13 @@
+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+COPY backend/pyproject.toml /app/pyproject.toml
+RUN pip install --no-cache-dir -e ".[dev]"
+
+COPY backend /app
+
+CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]