Initial commit: Bitwarden export to PDF renderer

Adds the render.py WeasyPrint renderer, the pod-based bitwarden-print.sh
wrapper, a Containerfile, a sample export (JSON + PDF), README and LICENSE.

Containerfile

@@ -0,0 +1,28 @@
+FROM docker.io/python:3.12-slim-bookworm
+
+ENV PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+# Runtime libraries required by WeasyPrint's Pango/HarfBuzz/Cairo stack.
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+      libpango-1.0-0 \
+      libpangoft2-1.0-0 \
+      libharfbuzz0b \
+      libfontconfig1 \
+      libcairo2 \
+      libgdk-pixbuf-2.0-0 \
+      libffi8 \
+      libjpeg62-turbo \
+      libopenjp2-7 \
+      shared-mime-info \
+      fonts-dejavu-core \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN pip install "weasyprint==62.3" "pydyf==0.10.0"
+
+WORKDIR /app
+COPY render.py /app/render.py
+
+ENTRYPOINT ["python3", "/app/render.py"]
+CMD ["--help"]