* chore: post-i18n cleanup and version bump to 1.5.0
- Restore missing .dockerignore entries (notebook_data, surreal_data, docs, etc.)
- Fix lint command for Next.js 16 (use eslint directly instead of next lint)
- Remove aria-describedby={undefined} causing Radix UI warnings
- Bump version to 1.5.0
- Update CHANGELOG with i18n features
- Add multi-language UI mention to README
- Add i18n contribution guide to README.dev
- Document i18n system in CLAUDE.md files
Closes#344, #349, #360
* docs: fix provider order in CLAUDE.md to match layout.tsx
