feat: Docker Compose deployment configuration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,18 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential libpq-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE ${DJANGO_PORT:-8000}
+
+CMD ["gunicorn", "--bind", "0.0.0.0:${DJANGO_PORT:-8000}", \
+     "--workers", "4", "--timeout", "120", \
+     "config.wsgi:application"]