docs: en translation

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[Copilot]

Pull request overview

Adds English-language documentation and introduces locale-aware routing/UI configuration for the Fumadocs-powered Next.js docs site.

Changes:

• Introduce i18n config and wire it into the Fumadocs source + layouts.
• Add [lang]-scoped layouts/pages and redirects to make /zh the default entry point while enabling /en.
• Add a large set of *.en.* docs pages and meta.en.json navigation files.

Reviewed changes

Copilot reviewed 68 out of 70 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
lib/source.ts	Injects i18n into the Fumadocs source loader.
lib/layout.shared.tsx	Defines shared layout options and i18n UI strings.
lib/i18n.ts	Declares supported languages and default language.
content/index.en.md	Adds English landing content (frontmatter-based).
content/docs/Tools/meta.en.json	Adds English nav metadata for Tools section.
content/docs/Tools/index.en.mdx	Adds English Tools documentation page.
content/docs/Hydro/user/testdata.en.mdx	Adds English “Test Data Format” page.
content/docs/Hydro/user/problem.en.mdx	Adds English “Problem” page.
content/docs/Hydro/user/problem-format.en.md	Adds English “Hydro Problem Format” page.
content/docs/Hydro/user/problem-create.en.md	Adds English “Problem Create” guide page.
content/docs/Hydro/user/permission.en.md	Adds English “Permission System” page.
content/docs/Hydro/user/meta.en.json	Adds English nav metadata for User guide section.
content/docs/Hydro/user/index.en.md	Adds English User documentation landing page.
content/docs/Hydro/user/domain.en.mdx	Adds English “Domain” page.
content/docs/Hydro/user/copy-problem.en.md	Adds English “Copy Problem” page.
content/docs/Hydro/system/onsite-contest.en.md	Adds English system guide for onsite contests.
content/docs/Hydro/system/meta.en.json	Adds English nav metadata for System docs.
content/docs/Hydro/system/maintain.en.md	Adds English maintenance guide.
content/docs/Hydro/system/import-user.en.mdx	Adds English “Import Users” guide.
content/docs/Hydro/system/frontend-modify.en.mdx	Adds English “Frontend Modification” guide.
content/docs/Hydro/system/database.en.mdx	Adds English DB backup/restore guide.
content/docs/Hydro/system/cli.en.mdx	Adds English CLI guide.
content/docs/Hydro/system/cdn.en.mdx	Adds English CDN guide.
content/docs/Hydro/plugins/vjudge.en.mdx	Adds English VJudge plugin page.
content/docs/Hydro/plugins/sonic.en.md	Adds English Sonic plugin page.
content/docs/Hydro/plugins/recaptcha.en.mdx	Adds English reCAPTCHA plugin page.
content/docs/Hydro/plugins/migrate.en.mdx	Adds English migrate plugin page.
content/docs/Hydro/plugins/meta.en.json	Adds English nav metadata for Plugins section.
content/docs/Hydro/plugins/index.en.mdx	Adds English Plugins landing/list page.
content/docs/Hydro/plugins/hydrojudge.en.mdx	Adds English hydrojudge plugin page.
content/docs/Hydro/plugins/geoip.en.md	Adds English GeoIP plugin page.
content/docs/Hydro/plugins/fps-importer.en.md	Adds English fps-importer plugin page.
content/docs/Hydro/plugins/extra.en.md	Adds English “Other/Premium” plugins page.
content/docs/Hydro/plugins/elastic.en.mdx	Adds English Elastic Search plugin page.
content/docs/Hydro/meta.en.json	Adds English nav metadata for Hydro section.
content/docs/Hydro/install/smtp.en.md	Adds English SMTP install guide.
content/docs/Hydro/install/s3.en.mdx	Adds English storage (S3) guide.
content/docs/Hydro/install/riscv.en.mdx	Adds English RISC-V installation guide.
content/docs/Hydro/install/proxy.en.mdx	Adds English reverse proxy/SSL guide.
content/docs/Hydro/install/meta.en.json	Adds English nav metadata for Install section.
content/docs/Hydro/install/index.en.mdx	Adds English “Deploy Hydro” guide.
content/docs/Hydro/install/compiler.en.mdx	Adds English compilers/languages guide.
content/docs/Hydro/index.en.mdx	Adds English Hydro introduction page.
content/docs/Hydro/dev/typescript.en.md	Adds English TypeScript plugin-dev guide.
content/docs/Hydro/dev/third-party-auth.en.md	Adds English third-party auth integration guide.
content/docs/Hydro/dev/naming.en.md	Adds English naming conventions guide.
content/docs/Hydro/dev/meta.en.json	Adds English nav metadata for Dev section.
content/docs/Hydro/dev/index.en.mdx	Adds English dev environment setup guide.
content/docs/Hydro/dev/hook.en.md	Adds English hooks guide.
content/docs/Hydro/dev/frontend-modify.en.md	Adds English dev frontend modification pointer page.
content/docs/Hydro/dev/db-layout.en.md	Adds English DB layout guide.
content/docs/Hydro/dev/PERM_PRIV.en.md	Adds English PERM/PRIV guide.
content/docs/Hydro/api/judge.en.md	Adds English judge protocol documentation.
content/docs/Hydro/FAQ/upgrade.en.md	Adds English upgrade guide.
content/docs/Hydro/FAQ/meta.en.json	Adds English nav metadata for FAQ section.
content/docs/Hydro/FAQ/index.en.mdx	Adds English FAQ landing/collection page.
content/docs/Hydro/FAQ/debug.en.md	Adds English debugging guide.
app/page.tsx	Redirects / to /zh.
app/layout.tsx	Adjusts root layout structure and removes RootProvider from the root.
app/layout.config.tsx	Removes old shared layout config (replaced by lib/layout.shared.tsx).
app/docs/[[...slug]]/page.tsx	Converts legacy /docs/* route into a redirect to /zh/docs/*.
app/api/search/route.ts	Makes search config locale-aware (zh tokenizer + en language).
app/[lang]/layout.tsx	Adds locale-scoped RootProvider wrapper and static params for languages.
app/[lang]/docs/[[...slug]]/page.tsx	Adds locale-aware docs page rendering.
app/[lang]/docs/[[...slug]]/layout.tsx	Switches docs layout tree/options to be locale-specific.
app/[lang]/(home)/page.tsx	Localizes the marketing home page content based on [lang].
app/[lang]/(home)/layout.tsx	Locale-aware HomeLayout wrapper using shared base options.
app/[lang]/(home)/images.tsx	Adds a client-side image carousel component.
app/[lang]/(home)/FeatureCard.tsx	Adds a reusable feature card component.
app/(home)/layout.tsx	Removes old non-i18n home layout.

Comments suppressed due to low confidence (1)

content/docs/Hydro/user/testdata.en.mdx:107

• There is an extra opening Markdown code fence (``` on its own) that is never closed, which will render the rest of the page as a code block. It also duplicates the following sentence. Please remove the stray fence and keep a single copy of the sentence/link.

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[Copilot]

Typo in the filename: probelm.yaml should be problem.yaml (this is also a real file name users will likely copy/paste).

[Copilot]

This section of the "*.en.md" page still contains Chinese content (e.g., the sample statement headings and text). If this page is meant to be the English translation, please translate these example blocks (or mark them clearly as untranslated) so English readers aren’t blocked.

[Copilot]

The link uses a Chinese heading anchor (#部署) in an English page, which likely won’t match the generated anchor IDs and will break navigation. Please update it to point to the English heading anchor (or link to the page without an anchor).

[Copilot]

This absolute link (/docs/Tools) will go through the legacy redirect and end up on the default (zh) locale. In an English doc, prefer a locale-preserving relative link (e.g., to the sibling top-level Tools section) so readers stay in the same language.

[Copilot]

The root tag is hardcoded to lang="zh", so English routes (e.g. /en/...) will still announce the document as Chinese, which hurts accessibility/SEO and can affect screen reader pronunciation. Please make the lang attribute reflect the active locale (or restructure layouts so the lang segment can control it).

[Copilot]

This English page includes Chinese/informal text in the example (e.g., "喵? tree", "任意文件名的文件夹", and Chinese YAML values). If this is intended as an English translation, please translate these parts or replace them with English equivalents to keep the locale consistent.