Remove the conditional retry logic and always run the venv creation, pip install of calibreweb, and uv sync without build isolation. Updated ct/calibre-web.sh and install/calibre-web-install.sh to: run `$STD uv venv`, `$STD uv pip install --python /opt/calibre-web/.venv/bin/python --no-cache-dir calibreweb`, then `$STD uv sync --no-dev --no-build-isolation`. This simplifies the dependency installation flow and ensures the virtualenv and package are installed before syncing.
Add retry logic to ct/calibre-web.sh and install/calibre-web-install.sh: if 'uv sync --no-dev' fails, the scripts now create/ensure a venv, install the 'calibreweb' package into it via 'uv pip', and retry 'uv sync' with '--no-build-isolation'. This works around failures caused by isolated builds or build-step issues and preserves existing log messages.