refactor(docs): cpp_backend 目录树规范化 — 下划线/大驼峰 → kebab-case

[longsizhuo]

背景

全站文档命名约定是 kebab-case，但 cpp_backend 整棵子树残留早期混用风格：

当前	规范化后
cpp_backend/	cpp-backend/
Handwritten_pool_components/	handwritten-pool-components/
easy_compile/	easy-compile/
1_Handwritten_threadpool.md	1-handwritten-threadpool.md
2_Handwritten_mempool1.md	2-handwritten-mempool1.md
1_cpp_libs.md / 2_base_gcc.md / 3_Make.md / 4_CMake.md / 5_vcpkg.md	kebab 化
mempool_simple.mdx	mempool-simple.mdx

保留数字前缀以维持 sidebar 阅读顺序（Fumadocs 按字母序排，去数字会打乱 1→5 教学顺序）。

变更

• 3 个目录 rename
• 8 份原文 + 7 份 .en.md 翻译 = 17 个文件 git mv
• next.config.mjs 新增 async redirects()，8 条 301 映射
• statusCode: 301（不是默认 permanent:true 的 308），Next.js 源码 allowedStatusCodes = {301,302,303,307,308} 合法

docId 守恒校验（✅ 全 8 个 docId 原样保留）

mempool-simple.mdx             → q8290wmhyofuiskzn1ph63ta
1-handwritten-threadpool.md    → mnjkrtrs7xk3fq538eqreuge
2-handwritten-mempool1.md      → xgxqqvglxyauoeh8eye7lzu6
1-cpp-libs.md                  → totx4pej5lhyt1nl4anwhakj
2-base-gcc.md                  → kyu85av71b4n07hbdycbhvj9
3-make.md                      → g6wucmr69lamd9xyxm7uunnd
4-cmake.md                     → xk44lx4q1gpcm1uqk8nnbg7q
5-vcpkg.md                     → gtqamuq3tftmvzstbunkgbo5

（.en.md 翻译版 docId 与原文一致，验证通过）

Reviewer subagent 发现 + 处理

误报 1：指 statusCode: 301 不是 Next.js 合法 API。
→ 经查 node_modules/next/dist/lib/redirect-status.js，allowedStatusCodes = new Set([301,302,303,307,308])，statusCode 合法；statusCode 与 permanent 互斥，本 PR 只用前者合规。

非阻塞 1：generated/doc-contributors.json / site-leaderboard.json 里有 stale path。
→ 这两个文件不应该手动改。sync-uuid.yml workflow 在本 PR 合 main 后会自动跑 backfill + generate-leaderboard + commit 回 main（格式 chore(docs): sync doc metadata）。这是我们 JSON-as-source-of-truth 架构的设计点，本 PR 保持 CI 自动更新。

采纳：注释里 "HTTP/1.0 Moved Permanently" 措辞不严谨（301 在 HTTP/1.0 时代引入但不叫 HTTP/1.0 状态码），已改。

合并顺序

和 #307 / #308 完全独立（改不同目录，不同 URL）。谁先合都行。

测试计划

• git rename detection 100% (17 个文件全部 R)
• docId 守恒（8 个 docId 对照通过）
• pnpm typecheck 通过
• node eval redirects() 返回 8 条全 statusCode:301
• 合 main 后 sync-uuid workflow 跑过，doc_paths 新路径加入并集，贡献者数不变
• Vercel preview 实测老 URL → 301 → 新 URL（8 条）
• multilingual 验证：preview 下 zh / en locale 看 cpp-backend 页面渲染

后续工作

• Leetcode 系列 {题号}.中文题名_translated.md 的规范化（50+ 文件）——涉及 pinyin 路由映射，需要另外规划
• ai/ 下的其他下划线目录（如 Introduction-of-Multi-agents-system/ 本身是 kebab 但内部文件用下划线）
• CommunityShare/ 内部结构的进一步分类

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[Copilot]

Pull request overview

This PR normalizes the cpp_backend docs subtree naming to kebab-case (directories + filenames) while preserving ordering via numeric prefixes, and adds server-side redirects so existing indexed/bookmarked URLs keep working.

Changes:

• Renamed cpp_backend subtree directories/files to kebab-case while keeping numeric prefixes for sidebar order.
• Added 8 explicit 301 redirects in next.config.mjs mapping old doc routes to new canonical routes.
• Moved/added the corresponding .en.* translated doc files alongside the renamed originals (docId preserved per description).

Reviewed changes

Copilot reviewed 1 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
next.config.mjs	Adds redirects() with 8 explicit 301 mappings for the renamed docs routes.
app/docs/computer-science/cpp-backend/mempool-simple.mdx	Doc moved to kebab-case path/slug.
app/docs/computer-science/cpp-backend/mempool-simple.en.mdx	English translation moved to kebab-case path/slug.
app/docs/computer-science/cpp-backend/handwritten-pool-components/1-handwritten-threadpool.md	Doc moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/handwritten-pool-components/1-handwritten-threadpool.en.md	English translation moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/handwritten-pool-components/2-handwritten-mempool1.md	Doc moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/handwritten-pool-components/2-handwritten-mempool1.en.md	English translation moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/1-cpp-libs.md	Doc moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/1-cpp-libs.en.md	English translation moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/2-base-gcc.md	Doc moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/2-base-gcc.en.md	English translation moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/3-make.md	Doc moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/3-make.en.md	English translation moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/4-cmake.md	Doc moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/4-cmake.en.md	English translation moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/5-vcpkg.md	Doc moved to kebab-case directory + filename.
app/docs/computer-science/cpp-backend/easy-compile/5-vcpkg.en.md	English translation moved to kebab-case directory + filename.

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[longsizhuo]

已合并到 #307 (commit dd7bf83)，改按 owner 要求三组 docs 整理放一个 PR 里方便 contributors review。