seo: bring meta descriptions into Bing's range, and add IndexNow

Bing Webmaster Tools flags meta descriptions under roughly 90-100
characters. It counts characters, so most Chinese, Japanese and Korean
pages failed even when the text read fine.

- Hand-written descriptions for the key site pages in 11 languages:
  home, pricing, support, team, the blog index and its categories. Plus
  16 docs pages whose text is too short to extend from.
- scripts/fit-meta-descriptions.mjs runs after both builds (v3/build.sh,
  deploy.sh and the docs workflow). It brings every other description to
  120-160 characters, using the page's opening sentences.
- Category descriptions now resolve for the transliterated zh/ja/ko
  slugs. Before, those pages only ever showed the generic text.
- IndexNow: the key file ships with the site from v3/public, and
  scripts/indexnow.mjs submits the live sitemaps. After deploying, each
  workflow submits its own half: the site or the docs.
- Translate the bodies of the Spanish team page and the German support
  page, which were still in English.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

v3/zh/home.html

@@ -4,12 +4,12 @@
 <head>
   <meta charset="utf-8">
   <title>RustDesk – 开源远程桌面访问软件</title>
-  <meta content="RustDesk 开源远程桌面访问解决方案：可以连接到远程计算机，提供远程支持和在线协作" name="description">
+  <meta content="RustDesk 是开源的远程桌面软件，可连接远程电脑，提供远程支持与在线协作。支持 Windows、macOS、Linux 和 Android，可自建服务器，让连接数据完全掌握在自己手中，是 TeamViewer 等商业远程软件的开源替代方案。" name="description">
   <meta content="RustDesk – 开源远程桌面访问软件" property="og:title">
-  <meta content="RustDesk 开源远程桌面访问解决方案：可以连接到远程计算机，提供远程支持和在线协作" property="og:description">
+  <meta content="RustDesk 是开源的远程桌面软件，可连接远程电脑，提供远程支持与在线协作。支持 Windows、macOS、Linux 和 Android，可自建服务器，让连接数据完全掌握在自己手中，是 TeamViewer 等商业远程软件的开源替代方案。" property="og:description">
   <meta content="https://repository-images.githubusercontent.com/299354207/a577aeea-619e-4f64-8dec-19f2550e7500" property="og:image">
   <meta content="RustDesk – 开源远程桌面访问软件" property="twitter:title">
-  <meta content="RustDesk 开源远程桌面访问解决方案：可以连接到远程计算机，提供远程支持和在线协作" property="twitter:description">
+  <meta content="RustDesk 是开源的远程桌面软件，可连接远程电脑，提供远程支持与在线协作。支持 Windows、macOS、Linux 和 Android，可自建服务器，让连接数据完全掌握在自己手中，是 TeamViewer 等商业远程软件的开源替代方案。" property="twitter:description">
   <meta content="https://repository-images.githubusercontent.com/299354207/a577aeea-619e-4f64-8dec-19f2550e7500" property="twitter:image">
   <meta property="og:type" content="website">
   <meta content="summary_large_image" name="twitter:card">