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

"Cloud" implied a single deployment shape (managed-only). "Enterprise"
is the accurate name for the layer — same Intelligence Platform runs
hosted at Copilot Cloud or self-hosted via the copilot-intelligence
Helm chart. The page already used "Enterprise" terminology in the
body; this aligns the slug, page title, and meta entry to match.

File renamed via git mv (history preserved). search-index.json paths
update on the next build (gitignored, regenerated).

Author: samjulien

showcase/shell-docs/src/content/docs/concepts/meta.json

@@ -1,4 +1,4 @@
 {
   "title": "Concepts",
-  "pages": ["architecture", "three-types-of-gen-ui", "oss-vs-cloud"]
+  "pages": ["architecture", "three-types-of-gen-ui", "oss-vs-enterprise"]
 }

…c/content/docs/concepts/oss-vs-cloud.mdx …tent/docs/concepts/oss-vs-enterprise.mdxshowcase/shell-docs/src/content/docs/concepts/oss-vs-cloud.mdx renamed to showcase/shell-docs/src/content/docs/concepts/oss-vs-enterprise.mdx showcase/shell-docs/src/content/docs/concepts/oss-vs-cloud.mdx renamed to showcase/shell-docs/src/content/docs/concepts/oss-vs-enterprise.mdx

@@ -1,5 +1,5 @@
 ---
-title: OSS vs Cloud
+title: OSS vs Enterprise
 description: What ships in CopilotKit's open-source core versus what's part of the Enterprise (Intelligence Platform) layer — Threads, Persistence, Observability, Self-Hosting.
 icon: "lucide/Cloud"
 doc_type: explanation