feat(i18n): 完整翻译 ja/ko + 5 locale 加 Beta 标识

[appergb]

User description

用户反馈

之前 `ja.ts` / `ko.ts` 只是 35 行 scaffold，缺失 key 全部 fallback 到英文，对日韩用户体验割裂。用户原话：

"完善为完整版本，并在语言名称后加 Beta 标识。"

改动

1. Beta 标识（5 个 locale）

`en/zh-CN/zh-TW/ja/ko` 的 `settings.language.{ja,ko}` 都加 ` (Beta)` 后缀。在任何 UI 语言下都能看到日韩为预览版本，符合 VS Code、Notion 等产品惯例（统一用英文 "Beta"，跨语言通用）。

2. ja.ts 完整翻译（35 → 569 行）

217 string 全翻译。保留 `...en` spread 作为安全网（未来新增 zh-CN key 时不会让 ja.ts 编译错，会 fallback 英文，提示团队补译）。

3. ko.ts 完整翻译（35 → 569 行）

同上。

翻译质量声明（重要）

AI 机器翻译初版：

• 全部占位符（`{{var}}`）和 markdown emphasis（`text`）原样保留
• 通过 `tsc strict` 校验（`typeof zhCN` 类型约束）
• 通过 `vite build`
• 建议：后续邀请 native speaker review 校准敬语 / 业务术语 / 文体一致性

解耦说明

此 PR 与 1.2.20 release 解耦（用户原话"解耦并放出新的语言包"），独立 ship 时机由 reviewer 决定。

Test plan

• `npx tsc --noEmit` 通过
• `npm run build` 通过
• PR CI `Windows Tauri checks` + `pr_agent_job`
• 本地 mac build 切换语言到日/韩，检查关键页（Overview、Settings、History、Vocab、Style）显示正确

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PR Type

Enhancement

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Description

• Completed Japanese (ja.ts) and Korean (ko.ts) translations (35 → 569 lines, 217 strings)

• Added (Beta) suffix to Japanese/Korean language names in all 5 locale files

• Retained ...en spread in ja.ts/ko.ts as fallback for newly added keys

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Diagram Walkthrough

flowchart LR
  A["ja.ts / ko.ts"] -- "expanded from 35 to 569 lines" --> B["Full translations (217 strings)"]
  C["en / zh-CN / zh-TW / ja / ko"] -- "add ' (Beta)' to ja/ko labels" --> D["Beta indicator in all UIs"]

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File Walkthrough

Relevant files

Enhancement

en.ts Add Beta label to Japanese and Korean in English locale    openless-all/app/src/i18n/en.ts Added (Beta) suffix to settings.language.ja and settings.language.ko +2/-2      ja.ts Complete Japanese translation (35 → 569 lines)                      openless-all/app/src/i18n/ja.ts Replaced scaffold (...en spread for most sections) with full translation of all 217 strings Kept top-level ...en spread as safety net for future keys Translated UI sections: app, common, capsule, qa, nav, shell, onboarding, overview, history, vocab, style, translation, selectionAsk, settings, modal, windowChrome, hotkey, localAsr +546/-8  ko.ts Complete Korean translation (35 → 569 lines)                          openless-all/app/src/i18n/ko.ts Replaced scaffold with full Korean translation of all 217 strings Kept top-level ...en spread for fallback Translated all UI sections (identical structure to ja.ts) +546/-8  zh-CN.ts Add Beta label for Japanese and Korean in Simplified Chinese openless-all/app/src/i18n/zh-CN.ts Added (Beta) suffix to settings.language.ja and settings.language.ko +2/-2      zh-TW.ts Add Beta label for Japanese and Korean in Traditional Chinese openless-all/app/src/i18n/zh-TW.ts Added (Beta) suffix to settings.language.ja and settings.language.ko +2/-2

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