docs(website): redirect old automation-templates URL to automation-blueprints

The Automation Blueprints rebrand (#44470) renamed the guide page from
guides/automation-templates to guides/automation-blueprints, leaving the
old URL 404ing. The site deploys to static hosting, so server-side
redirects aren't available.

Add @docusaurus/plugin-client-redirects (pinned 3.9.2, same as the other
Docusaurus packages) and a redirect entry for the old slug. The plugin
emits a static HTML page at the old path that meta-refresh/JS-redirects
to the new page, preserving query string and hash, with a canonical link
for SEO. Localized routes are handled automatically (zh-Hans verified).

website/package.json

@@ -19,6 +19,7 @@
   },
   "dependencies": {
     "@docusaurus/core": "3.9.2",
+    "@docusaurus/plugin-client-redirects": "3.9.2",
     "@docusaurus/preset-classic": "3.9.2",
     "@docusaurus/theme-mermaid": "^3.9.2",
     "@easyops-cn/docusaurus-search-local": "^0.55.1",