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)/apply/staff/page.tsx

@@ -14,10 +14,6 @@ import {
 import { formatDate } from "@/lib/format-date";
 import { resolveHotelName } from "@/lib/hotel-name";
 
-// 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;
-
 // Canonical Habbo badge image CDN (same base used by the profile page).
 const BADGE_IMG_BASE = "https://images.habbo.com/c_images/album1584";
 

src/app/(site)/apply/team/page.tsx

@@ -8,10 +8,6 @@ import { auth } from "@/lib/auth";
 import { db, WebsiteStaffApplications, WebsiteTeams } from "@/lib/db";
 import { resolveHotelName } from "@/lib/hotel-name";
 
-// 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;
-
 // Canonical Habbo badge image CDN (same base used by the profile page).
 const BADGE_IMG_BASE = "https://images.habbo.com/c_images/album1584";