LaTeX: install texlive-xetex + texlive-lang-french; better log hints for xelatex

LaTeX: use xelatex on Linux; add DejaVu fonts; rely on latexmk

Docker: install texlive-lm to provide lmodern.sty (fix LaTeX error)

Docker: drop apt tectonic (not in debian stable); rely on latexmk

Docker: install tectonic alongside latexmk to avoid exit 12

Docker: add texlive-fonts-extra for fontawesome/sourcesanspro

Docker: run as non-root and chown /app for write perms

Docker: run with venv python

Docker: avoid uv at runtime; use venv PATH

Docker: install uv into /usr/local/bin

Docker: copy uv.lock for uv sync --frozen

Fix Docker: add uv to PATH

Deploy to HF Space: Docker + Gradio MCP + UUID filenames

Initial commit