Switch to Django with visitor tracking and server info footnote

Dockerfile

@@ -0,0 +1,16 @@
+FROM python:3.12-slim
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+# Build-time only — overridden at runtime via docker-compose env
+ARG DJANGO_SECRET_KEY=build-placeholder
+ENV DJANGO_SECRET_KEY=$DJANGO_SECRET_KEY
+
+RUN python manage.py collectstatic --noinput
+
+EXPOSE 8080
+ENTRYPOINT ["./entrypoint.sh"]