[FIX] Use pnpm with managed Node.js for rtlcss

Use `pnpm env use --global lts` to install Node.js via pnpm,
ensuring both Node.js and rtlcss are available at runtime
without replacing pnpm with apt nodejs/npm.

Fixes #63

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

images/odoo/Dockerfile

@@ -129,11 +129,15 @@ RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ bookworm-pgdg main' > /et
     && rm -f /etc/apt/sources.list.d/pgdg.list \
     && rm -rf /var/lib/apt/lists/*
 
-# Install Node.js and rtlcss
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends nodejs npm && \
-    npm install -g rtlcss && \
-    rm -rf /var/lib/apt/lists/*
+# Install pnpm
+RUN curl -fsSL https://get.pnpm.io/install.sh | SHELL=/bin/bash bash -
+
+# Add pnpm to PATH
+ENV PNPM_HOME="/root/.local/share/pnpm"
+ENV PATH="$PNPM_HOME:$PATH"
+
+# Install Node.js via pnpm and install rtlcss globally
+RUN pnpm env use --global lts && pnpm install -g rtlcss
 
 # Install uv for Python package management
 COPY --from=ghcr.io/astral-sh/uv:0.7.21 /uv /uvx /bin/