Add Chinese translation of ObjectQL homepage

- Translate all 5 sections to Chinese
- Maintain technical terminology accuracy
- Keep same structure as English version
- Update hero section with compiler positioning
- Add Schema to SQL comparison example
- Include 3 pillars, comparison table, and driver ecosystem

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot