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/translations/client/page.tsx

@@ -7,10 +7,6 @@ import {
 } from "@/lib/client-translation-files";
 import { ClientTranslations } from "./client-translations";
 
-// 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 ClientTranslationsPage({
 	searchParams,
 }: {

src/app/admin/translations/cms/page.tsx

@@ -2,10 +2,6 @@ import fs from "node:fs/promises";
 import path from "node:path";
 import { TranslationsClient } from "../translations-client";
 
-// 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;
-
 const LOCALES = [
 	"en",
 	"it",

src/app/admin/translations/emulator/page.tsx

@@ -7,10 +7,6 @@ import { Button } from "@/components/ui/button";
 import { calcPagination } from "@/lib/admin-helpers";
 import { db, EmulatorSettings } from "@/lib/db";
 
-// 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;
-
 const TRANSLATION_KEY_PATTERNS = [
 	"commands.description.",
 	"commands.keys.",

src/app/admin/translations/layout.tsx

@@ -2,10 +2,6 @@ import { redirect } from "next/navigation";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 import { TranslationsTabs } from "./translations-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 TranslationsLayout({
 	children,
 }: {

src/app/admin/translations/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;
-
 // Default landing for /admin/translations → first tab.
 // The shared TranslationsTabs (in layout.tsx) gives access to every section.
 export default function TranslationsHubPage() {