feat: speed up admin clone import and enable Cache Components

- Clone import: defer FurnitureData.json writes and append all entries in a
  single batched write instead of one read-modify-write per item, removing
  the main serialization bottleneck for large batches.
- Clone import: raise SSE batch concurrency cap from 5 to 10 and bump the
  clone client/route default from 2 to 6.
- Add a flush hook to runSseBatch so callers can batch deferred work before
  batch_complete is emitted, and surface flush errors as an error event.
- Enable Next.js Cache Components (instant: false opt-out) and silence the
  related build warnings in next.config.ts.
- Switch isomorphic-dompurify to dompurify and refresh dependencies.

src/app/api/radio/auto-play/route.ts

@@ -5,8 +5,6 @@
 import { apiJson } from "@/lib/api";
 import { siteSettings } from "@/lib/services/site-settings";
 
-export const dynamic = "force-dynamic";
-
 function truthy(value: string | null | undefined): boolean {
 	if (value === undefined || value === null) return false;
 	const s = value.trim().toLowerCase();

src/app/api/radio/config/route.ts

@@ -4,7 +4,6 @@ import { siteSettings } from "@/lib/services/site-settings";
 // Radio player config: the subset of radio_* website_settings the front-end
 // player needs (stream URL, name, autoplay, enabled, widget visibility) as a
 // flat { key: value } map. No secrets live among these keys.
-export const dynamic = "force-dynamic";
 
 const CONFIG_KEYS = [
 	"radio_enabled",

src/app/api/radio/current-dj/route.ts

@@ -6,7 +6,6 @@ import { siteSettings } from "@/lib/services/site-settings";
 // Current on-air DJ. The DJ is set manually via the radio_current_dj_id setting
 // (Manual DJ user ID). When set, resolve that user's username/look; otherwise
 // there is no DJ on air. Mirrors the AtomCMS radio "on air" widget.
-export const dynamic = "force-dynamic";
 
 export async function GET(_req: Request) {
 	try {

src/app/api/radio/embed-config/route.ts

@@ -4,7 +4,6 @@ import { siteSettings } from "@/lib/services/site-settings";
 // Minimal radio_* settings an external page needs to embed the player: stream
 // URL, display name, whether the radio is enabled, and autoplay. Returned as a
 // flat { key: value } map. None of these keys are secrets.
-export const dynamic = "force-dynamic";
 
 const EMBED_KEYS = [
 	"radio_enabled",

src/app/api/radio/listeners/route.ts

@@ -4,7 +4,6 @@ import { siteSettings } from "@/lib/services/site-settings";
 // Proxy for the configured radio "listeners" provider. The provider URL is
 // stored in radio_listeners_api_url; we fetch it server-side with a short, hard
 // timeout and reduce the response to a single listener count.
-export const dynamic = "force-dynamic";
 
 const FETCH_TIMEOUT_MS = 4000;
 

src/app/api/radio/now-playing/route.ts

@@ -4,7 +4,6 @@ import { siteSettings } from "@/lib/services/site-settings";
 // Proxy for the configured radio "now playing" provider. The provider URL is
 // stored in radio_now_playing_api_url; we fetch it server-side (never exposing
 // the URL or any provider key to the browser) with a short, hard timeout.
-export const dynamic = "force-dynamic";
 
 const FETCH_TIMEOUT_MS = 4000;
 

src/app/api/radio/points/leaderboard/route.ts

@@ -5,7 +5,6 @@ import { db, RadioListenerPoints, User } from "@/lib/db";
 // Radio listener-points leaderboard: the top 20 users by total points, summed
 // across radio_listener_points and joined to users for username/look. Public
 // (no auth) — mirrors the AtomCMS radio leaderboard widget.
-export const dynamic = "force-dynamic";
 
 export async function GET(_req: Request) {
 	try {

src/app/api/radio/points/route.ts

@@ -5,7 +5,6 @@ import { db, RadioListenerPoints } from "@/lib/db";
 
 // The Bearer-authed user's total radio listener points: the sum of all
 // radio_listener_points.points rows for that user_id.
-export const dynamic = "force-dynamic";
 
 export async function GET(req: Request) {
 	const uid = await bearerUserId(req);

src/app/api/radio/shouts/route.ts

@@ -6,7 +6,6 @@ import { db, RadioShouts, User } from "@/lib/db";
 // Latest 50 radio shouts with their author's username/look resolved. Mirrors the
 // query behind the public /radio/shouts page (radio_shouts ordered by created_at
 // desc, then joined to users by user_id).
-export const dynamic = "force-dynamic";
 
 // Max shout length (radio_shouts.message is TEXT; cap to keep posts sane).
 const MAX_MESSAGE_LENGTH = 255;

src/app/api/radio/stream/route.ts

@@ -1,7 +1,5 @@
 import { fetchListeners, fetchNowPlaying } from "@/lib/services/radio";
 
-export const dynamic = "force-dynamic";
-
 /**
  * Server-Sent Events stream of live radio state (AtomCMS's radio SSE endpoint).
  * Pushes { nowPlaying, listeners } every ~10s so players/widgets get real-time