Add Docker deployment and per-player secret-link viewers.

Each player gets an isolated SQLite viewer via a unique URL without login, with landing page warnings to save the link and compose-based hosting for sharing with others.

Co-authored-by: Cursor <cursoragent@cursor.com>

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    DATA_DIR=/data
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app.py db.py parser.py categories.py validation.py viewers.py ./
+COPY templates/ templates/
+COPY static/ static/
+
+RUN mkdir -p /data/viewers /data/uploads
+
+VOLUME ["/data"]
+EXPOSE 5000
+
+CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--workers", "2", "--threads", "4", "app:app"]