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/docusaurus.config.ts

@@ -66,6 +66,23 @@ const config: Config = {
     ],
   ],
 
+  plugins: [
+    [
+      '@docusaurus/plugin-client-redirects',
+      {
+        // Static-host redirects for renamed doc pages (GitHub Pages can't
+        // do server-side redirects). Paths are relative to baseUrl (/docs/).
+        redirects: [
+          {
+            // Renamed in #44470 (Automation Blueprints terminology rebrand)
+            from: '/guides/automation-templates',
+            to: '/guides/automation-blueprints',
+          },
+        ],
+      },
+    ],
+  ],
+
   presets: [
     [
       'classic',