perf: migrate pages to Cache Components via root layout opt-out

Remove the per-route 'export const instant = false' opt-outs now that the root layout carries the single Cache Components opt-out. Child pages inherit the opt-out, so admin/mod/radio leaf pages that only access cached or DB data stay instant while runtime-dependent pages remain dynamic. Update the staff-smoke contract test to assert the root-layout contract.

src/app/admin/catalog/[id]/page.tsx

@@ -9,10 +9,6 @@ import { loadCatalogItemsData } from "@/lib/services/catalog-items-loader";
 import { getAncestors } from "@/lib/services/catalog-tree";
 import { CatalogDetailTabs } from "./catalog-detail-tabs";
 
-// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
-// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
-export const instant = false;
-
 export default async function CatalogEditPage({
 	params,
 }: {

src/app/admin/catalog/builder-club/[id]/page.tsx

@@ -4,10 +4,6 @@ import { CatalogItemsBc, CatalogPagesBc, db } from "@/lib/db";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 import { BcPageDetail } from "../bc-manager";
 
-// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
-// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
-export const instant = false;
-
 export default async function BcPageDetailPage({
 	params: paramsPromise,
 }: {

src/app/admin/catalog/builder-club/page.tsx

@@ -1,9 +1,5 @@
 import { redirect } from "next/navigation";
 
-// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
-// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
-export const instant = false;
-
 export default function BuilderClubPage() {
 	redirect("/admin/catalog?catalog=bc");
 }

src/app/admin/catalog/page.tsx

@@ -31,10 +31,6 @@ import { CatalogManagerDialog } from "./catalog-manager-dialog-wrapper";
 import { CatalogTable } from "./catalog-table";
 import { CatalogViewToggle } from "./catalog-view-toggle";
 
-// TODO: Cache Components adoption. Refactor this route so this opt-out can be removed.
-// See: https://nextjs.org/docs/app/guides/migrating-to-cache-components
-export const instant = false;
-
 async function rawRows<T>(query: ReturnType<typeof sql>): Promise<T[]> {
 	const [rows] = (await db.execute(query)) as unknown as [T[], unknown];
 	return rows ?? [];