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/(site)/help/[category]/page.tsx

@@ -8,10 +8,6 @@ import { db, WebsiteHelpCenterCategories } from "@/lib/db";
 import { resolveHotelName } from "@/lib/hotel-name";
 import { sanitize } from "@/lib/sanitize";
 
-// 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;
-
 // Asset path matches AtomCMS's Blade view: asset('/assets/images/help-center/<image_url>').
 const HELP_IMAGE_BASE = "/assets/images/help-center";
 

src/app/(site)/help/page.tsx

@@ -9,10 +9,6 @@ import {
 	WebsiteRules,
 } 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;
-
 type HelpCategory = {
 	id: bigint;
 	name: string;

src/app/(site)/help/tickets/[id]/page.tsx

@@ -15,10 +15,6 @@ import {
 } from "@/lib/db";
 import { formatDate } from "@/lib/format-date";
 
-// 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;
-
 type SearchParams = Promise<{
 	replied?: string;
 	closed?: string;

src/app/(site)/help/tickets/page.tsx

@@ -9,10 +9,6 @@ import { auth } from "@/lib/auth";
 import { db, WebsiteHelpCenterTickets } from "@/lib/db";
 import { formatDate } from "@/lib/format-date";
 
-// 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;
-
 type SearchParams = Promise<{ created?: string; error?: string }>;
 
 function feedbackStyle(tone: "success" | "error"): CSSProperties {