Add "How to Calculate ROI" tool page with i18n and routing | Dev Logs

Date: 2026-01-28 12:00 Summary: Add "How to Calculate ROI" tool page with i18n and routing

[question] 按照默认规则，设计和开发工具how to calculate roi (See above for file contents. You may not need to search or read the file again.)

[try to solve]

• Added a new localized tool "How to Calculate ROI" with UI, formula, example, and interpretation.
• Updated src/site/tools.ts to register the tool in the site index.
• Added i18n strings for the ROI tool in these language files: src/site/i18n/en.ts, zh.ts, fr.ts, de.ts, es.ts, pt.ts, ru.ts, ja.ts, id.ts, ar.ts.
• Created page renderer src/pages/howToCalculateRoiPage.ts and registered it in src/index.ts.

[actions]

• Modified: src/site/tools.ts
• Modified: src/index.ts
• Added: src/pages/howToCalculateRoiPage.ts
• Modified: src/site/i18n/en.ts
• Modified: src/site/i18n/zh.ts
• Modified: src/site/i18n/fr.ts
• Modified: src/site/i18n/de.ts
• Modified: src/site/i18n/es.ts
• Modified: src/site/i18n/pt.ts
• Modified: src/site/i18n/ru.ts
• Modified: src/site/i18n/ja.ts
• Modified: src/site/i18n/id.ts
• Modified: src/site/i18n/ar.ts