Add Docker support with Dockerfile and entrypoint

Dockerfile

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+FROM python:3.11-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+# Create volume mount points
+RUN mkdir -p /app/media /app/static /app/data
+
+# Collect static files at build time (uses a dummy key, no DB needed)
+RUN SECRET_KEY=build-time-placeholder DB_ENGINE=sqlite python manage.py collectstatic --noinput
+
+EXPOSE 8000
+
+RUN chmod +x entrypoint.sh
+ENTRYPOINT ["./entrypoint.sh"]