Fix blog route conflict that crashed the Next.js server.

Rename legacy /blog/[slug] redirect to /blog/[id] so it matches the nested [id]/[slug] segment name.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/blog/[id]/page.tsx

@@ -0,0 +1,22 @@
+import { notFound, redirect } from "next/navigation";
+import { blogHref, fetchBlogBySlug } from "@/lib/blog";
+import { getBlogPost } from "@/lib/data";
+
+export const revalidate = 60;
+
+/** Legacy `/blog/{slug-or-id}` → canonical `/blog/{id}/{titleSlug}`. */
+export default async function LegacyBlogRedirect({
+  params,
+}: {
+  params: Promise<{ id: string }>;
+}) {
+  const { id } = await params;
+
+  const apiPost = await fetchBlogBySlug(id);
+  if (apiPost) redirect(blogHref(apiPost));
+
+  const local = getBlogPost(id);
+  if (local) redirect(blogHref({ id: local.slug, title: local.title }));
+
+  notFound();
+}