feat(build): add com and cn site build targets

- Rename the package and deployment domains to opensource.onixbyte.com
  and opensource.onixbyte.cn
- Extract a createConfig(target) factory in rspress.config.ts, with a
  thin rspress.cn.config.ts wrapper and build:com / build:cn scripts
- Make the cn build lead with zh-hans, add a Douyin social link, and
  omit international links such as X
- Emit canonical, hreflang alternate and Open Graph tags, plus a
  sitemap with per-route priorities and a generated robots.txt
- Remove the Gitea and GitLab CI pipelines and point the Vercel
  redirect at opensource.onixbyte.cn
- Drop the resolved Microsoft email delivery notice from the
  notifications pages

docs/en-gb/notifications/index.md

@@ -2,18 +2,3 @@
 title: Notifications
 ---
 
-## Microsoft Email Delivery Issues (@outlook, @hotmail, @live, @msn and custom domain emails hosted on Microsoft)
-
-> Updated at *19 May 2026*.
-
-**Urgent Action Required for Users with Microsoft-Hosted Emails.**
-
-Please be advised that our automated email service is currently experiencing severe delivery issues to all email addresses hosted by Microsoft. Due to recent aggressive filtering policies by their Exchange Online Protection (EOP), our mail delivery server has been blocked by Microsoft. As a consequence, our system is **unable to send any notifications, password resets, or activation emails** to accounts ending in **@outlook.com**, **@hotmail.com**, **@live.com**, **@msn.com**, or **indeed any custom domains hosted by Microsoft**.
-
-To ensure uninterrupted service, please follow the guidance below based on your account status:
-
-- For Prospective Users (Before Registration): Please **do not** use a Microsoft-hosted email address to register your account. You will not receive the essential activation link. Kindly use an alternative email service provider, such as your corporate email, Gmail, etc. to complete your registration.
-- For Existing Registered Users: If your profile is currently linked to an Outlook or Hotmail address, please log in immediately and update your primary email address. You can change this by navigating to your **[User Settings -> Preferences -> Emails](https://git.onixbyte.cn/-/profile/emails)** page. Failing to do so will result in missing critical repository updates, CI/CD pipeline failure logs, and Merge Request notifications.
-
-We are actively working to appeal this block with the Microsoft Postmaster Centre. We sincerely apologise for any inconvenience caused and appreciate your prompt cooperation in updating your contact details.
-

docs/zh-hans/notifications/index.md

@@ -2,18 +2,3 @@
 title: 通知
 ---
 
-## Microsoft 邮件投递问题（@outlook、@hotmail、@live、@msn 以及托管在 Microsoft 的自定义域名邮箱）
-
-> 更新于 *2026 年 5 月 19 日*
-
-**使用 Microsoft 托管邮箱的用户需立即采取行动。**
-
-特此通知，我们的自动邮件服务目前向所有由 Microsoft 托管的邮箱地址投递时遇到严重问题。由于 Microsoft Exchange Online Protection (EOP) 近期采取了激进的过滤策略，我们的邮件投递服务器已被 Microsoft 屏蔽。因此，我们的系统**无法向以下邮箱地址发送任何通知、密码重置或激活邮件**：**@outlook.com**、**@hotmail.com**、**@live.com**、**@msn.com**，以及**任何由 Microsoft 托管自定义域名的邮箱**。
-
-为确保服务不受影响，请根据您的账户状态参考以下指引：
-
-- **新用户（注册前）**：请**不要**使用 Microsoft 托管的邮箱地址注册账户。您将无法收到必要的激活链接。请使用其他邮件服务商，例如您的企业邮箱、QQ 邮箱或网易 163 邮箱完成注册。
-- **已注册用户**：如果您的账户当前绑定了 Outlook 或 Hotmail 邮箱地址，请立即登录并更新您的主邮箱。您可以通过 **[用户设置 -> 偏好设置 -> 邮箱](https://git.onixbyte.cn/-/profile/emails)** 页面进行更改。未能及时更新将导致您无法收到重要的仓库更新、CI/CD 流水线失败日志以及合并请求通知。
-
-我们正在积极与 Microsoft Postmaster Centre 沟通，以申请解除此屏蔽。对于由此带来的任何不便，我们深表歉意，并感谢您及时配合更新联系信息。
-