Admin: add edit page (GET/POST), live preview; list shows Edit button; inject page title + watermark on public pages; clean header (only one logout); alignment via flex; add Dockerfile and docker-compose.yml; add gunicorn

Dockerfile

@@ -0,0 +1,17 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# System deps (optional): none needed for sqlite
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt gunicorn
+
+COPY . .
+
+ENV FLASK_ENV=production
+ENV PORT=5000
+EXPOSE 5000
+
+CMD ["gunicorn", "-b", "0.0.0.0:5000", "app:app", "--workers", "2", "--threads", "4", "--timeout", "60"]
+