本次优化新增俄语界面支持，在主页面和 API 文档中加入语言切换入口，并覆盖现有前端文案。日期和时间随所选语言显示，俄语界面中缺失的翻译优先回退到英文，同时保留语言选择，刷新后仍可继续使用。
This update adds Russian interface support, including language switchers on the main page and API documentation, with translations covering the existing frontend catalog. Dates and times follow the selected locale, missing Russian translations fall back to English first, and the language preference persists across page reloads.