feat: add comprehensive GitHub workflow and development tools

app/Dockerfile

@@ -0,0 +1,16 @@
+FROM python:3.12-slim
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential libpq-dev postgresql-client \
+    libpango-1.0-0 libcairo2 libffi-dev \
+    libjpeg-dev libpng-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY requirements.txt /app/
+RUN pip install --no-cache-dir -r requirements.txt
+COPY . /app
+
+CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]