Move Playwright, Docker, and package.json into examples/django-react-site

Root directory now contains only the two core packages (django/, react/),
examples/, and top-level docs. All e2e/integration test infrastructure
lives in examples/django-react-site/.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

examples/django-react-site/Dockerfile.test

@@ -0,0 +1,21 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install mizan from local source with channels support
+COPY django/ /app/django/
+RUN pip install --no-cache-dir /app/django[channels] daphne
+
+# Copy example app
+COPY examples/django-react-site/backend/ /app/example/
+
+WORKDIR /app/example
+
+EXPOSE 8000
+
+CMD ["sh", "-c", "python manage.py migrate --run-syncdb && daphne -b 0.0.0.0 -p 8000 testapp.asgi:application"]