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/users/[id]/edit/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;
-
 /**
  * Legacy URL — the canonical edit UI lives at /admin/users/edit/[id]
  * and is gated by PERMS.USERS_EDIT.

src/app/admin/users/[id]/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;
-
 /** Legacy route — redirects to /admin/users/show/[id] */
 export default async function UserLegacyPage({
 	params,

src/app/admin/users/edit/[id]/page.tsx

@@ -14,10 +14,6 @@ import { UserEditForm } from "../../[id]/user-edit-form";
 import { UserQuickActions } from "../../[id]/user-quick-actions";
 import { UserRooms } from "../../[id]/user-rooms";
 
-// 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 UserEditPage({
 	params,
 }: {

src/app/admin/users/multi-accounts/page.tsx

@@ -9,10 +9,6 @@ import { Badge } from "@/components/ui/badge";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
-// 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 MultiAccountsPage({
 	searchParams,
 }: {

src/app/admin/users/page.tsx

@@ -8,10 +8,6 @@ import { canAccess, PERMS } from "@/lib/permissions";
 import { CreateUserDialog } from "./_components/create-user-dialog";
 import { UsersTable } from "./users-table";
 
-// 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 UsersPage({
 	params: paramsPromise,
 	searchParams,

src/app/admin/users/show/[id]/page.tsx

@@ -13,10 +13,6 @@ import { UserActivityLog } from "../../[id]/user-activity-log";
 import { UserQuickActions } from "../../[id]/user-quick-actions";
 import { UserRooms } from "../../[id]/user-rooms";
 
-// 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 UserShowPage({
 	params,
 }: {