fix(shell-docs): 301 /concepts/oss-vs-cloud → /concepts/oss-vs-enterprise

The previous commit renamed the file but didn't add a redirect, so
any open browser tab or external link to /concepts/oss-vs-cloud now
404s — surfacing as a "sidebar disappeared" experience because the
404 page doesn't render the docs shell. Add the 301 redirect alongside
the migrate-to-* and frontend-actions ones.

Author: samjulien

showcase/shell-docs/next.config.ts

@@ -84,6 +84,15 @@ const nextConfig: NextConfig = {
         destination: "/migrate/1.8.2",
         permanent: true,
       },
+      // Concept page renamed from "OSS vs Cloud" to "OSS vs Enterprise"
+      // because "Cloud" implied a single deployment shape — the layer is
+      // the Intelligence Platform, which runs hosted at Copilot Cloud
+      // OR self-hosted via the Helm chart. "Enterprise" covers both.
+      {
+        source: "/concepts/oss-vs-cloud",
+        destination: "/concepts/oss-vs-enterprise",
+        permanent: true,
+      },
     ];
   },
 };