fix: installer Pandoc 3.8 depuis GitHub au lieu d'apt

- Apt installe une version ancienne qui ne supporte pas tex_math_dollars+gfm
- Téléchargement direct de Pandoc 3.8 depuis GitHub releases
- Compatible avec la conversion LaTeX → MDX

Dockerfile

@@ -2,8 +2,14 @@
 # Build with Playwright (browsers and deps ready)
 FROM mcr.microsoft.com/playwright:v1.55.0-jammy AS build
 
-# Install git, git-lfs, and pandoc for handling LFS files and LaTeX conversion
-RUN apt-get update && apt-get install -y git git-lfs pandoc && apt-get clean
+# Install git, git-lfs, and dependencies for Pandoc
+RUN apt-get update && apt-get install -y git git-lfs wget && apt-get clean
+
+# Install latest Pandoc from GitHub releases (not apt which is outdated)
+RUN wget -qO- https://github.com/jgm/pandoc/releases/download/3.8/pandoc-3.8-linux-amd64.tar.gz | tar xzf - -C /tmp && \
+    cp /tmp/pandoc-3.8/bin/pandoc /usr/local/bin/ && \
+    cp /tmp/pandoc-3.8/bin/pandoc-lua /usr/local/bin/ && \
+    rm -rf /tmp/pandoc-3.8
 
 # Set the working directory in the container
 WORKDIR /workspace