docs: improve i18n docs

[zllkjc]

Summary

中文

• 重构中文 i18n 文档导航：移除 basic 页面入口，调整概览页为“从哪里开始”表格，帮助用户按场景进入 quick-start、configuration、routing、resource-loading 等页面。
• 精简并重写快速开始、配置说明、语言检测、路由集成、资源加载、API、高级用法等章节，突出 CLI 配置与 runtime 配置职责、backend 自动启用规则、SDK/链式后端、SSR 等关键流程。
• 补充最佳实践内容，包括 namespace 组织、翻译键命名、复数、嵌套键、格式化插值、加载状态与类型安全等建议。
• 同步更新 i18n 相关文档组件中的安装命令、初始化说明和示例代码，使示例与新的文档结构保持一致。

English

• Refactors the Chinese i18n documentation navigation by removing the basic page entry and turning the overview into a scenario-based “where to start” table.
• Rewrites and streamlines quick start, configuration, locale detection, routing, resource loading, API, and advanced usage docs, with clearer guidance for CLI/runtime config ownership, backend auto enablement, SDK/chained backend, and SSR flows.
• Expands best practices for namespace organization, translation key naming, plurals, nested keys, formatted interpolation, loading states, and type safety.
• Updates shared i18n doc components for install commands, initialization notes, and example code so they align with the revised documentation.

Related Links

Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

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