Fix Next dynamic route conflict that crashed the whole site.

Use matching [id] segment names for one- and two-segment user-product paths so standalone no longer throws on every request.

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

src/app/user-products/[id]/page.tsx

@@ -0,0 +1,27 @@
+import { notFound, redirect } from "next/navigation";
+import {
+  getUserProductByIdOrNull,
+  getUserProductBySlugOrNull,
+  userProductHref,
+} from "@/lib/api/user-products";
+
+type PageProps = {
+  params: Promise<{ id: string }>;
+};
+
+/**
+ * One-segment `/user-products/{idOrLegacySlug}`:
+ * - numeric/id → load by-id and redirect to canonical `/user-products/{id}/{pathSlug}`
+ * - legacy DB slug (e.g. user-product-5) → same redirect
+ */
+export default async function UserProductIdRedirect({ params }: PageProps) {
+  const { id } = await params;
+
+  const byId = await getUserProductByIdOrNull(id);
+  if (byId) redirect(userProductHref(byId));
+
+  const bySlug = await getUserProductBySlugOrNull(id);
+  if (bySlug) redirect(userProductHref(bySlug));
+
+  notFound();
+}

src/app/user-products/[slug]/page.tsx

@@ -1,17 +0,0 @@
-import { notFound, redirect } from "next/navigation";
-import {
-  getUserProductBySlugOrNull,
-  userProductHref,
-} from "@/lib/api/user-products";
-
-type PageProps = {
-  params: Promise<{ slug: string }>;
-};
-
-/** Legacy `/user-products/{db-slug}` → canonical `/user-products/{id}/{pathSlug}`. */
-export default async function LegacyUserProductRedirect({ params }: PageProps) {
-  const { slug } = await params;
-  const product = await getUserProductBySlugOrNull(slug);
-  if (!product) notFound();
-  redirect(userProductHref(product));
-}