The ``oca-gen-addon-readme`` entry is a multi-line YAML scalar. The
prettier hook rewrites it on every run in each target repo, producing a
recurring local diff against the deployed copy. Format the source configs
with the exact prettier versions deployed per version (2.7.1 for 16.0,
3.3.3 for 18.0) so the deployed files already match the hook output.
No functional change: YAML folds the scalar newlines into spaces either
way.
Add config/18.0/ with configuration files based on OCA standards:
- .pylintrc and .pylintrc-mandatory (valid-odoo-versions=18.0)
- .ruff.toml (Python linting)
- .pre-commit-config.yaml with updated hooks:
- whool-init (new in 18.0)
- oca-gen-external-dependencies (new in 18.0)
- Updated prettier 3.x and eslint 9.x
- eslint.config.cjs and prettier.config.cjs (new flat config format)
Also move .eslintrc.yml and .prettierrc.yml to config/16.0/ since
18.0 uses the new CJS flat config format instead of YAML.
