Date: 2026-01-12
Summary: Create BMI calculator tool page with multilingual and SEO support
[question] 创建工具：how to calculate bmi ，需要支持多国语言，符合seo，界面参考目前的工具页面布局。
[try to solve] Created a new BMI calculator tool page (how-to-calculate-bmi) under src/pages, following the current tool page layout. Added multilingual support (Chinese and English) and included SEO meta tags and a concise tool description. Registered the new tool in the route registrar for dynamic access at /tools/how-to-calculate-bmi and /zh/tools/how-to-calculate-bmi, etc. The interface matches the style of existing tools and supports BMI calculation with instant result display.
[actions] src/pages/howToCalculateBmiPage.ts src/site/i18n/en.ts src/site/i18n/zh.ts src/index.ts