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/articles/[slug]/comment/route.ts

@@ -11,8 +11,6 @@ import { apiError, apiJson } from "@/lib/api";
 import { bearerUserId } from "@/lib/api-auth";
 import { db, WebsiteArticleComments, WebsiteArticles } from "@/lib/db";
 
-export const dynamic = "force-dynamic";
-
 export async function POST(
 	req: Request,
 	{ params }: { params: Promise<{ slug: string }> },

src/app/api/articles/[slug]/route.ts

@@ -2,8 +2,6 @@ import { eq } from "drizzle-orm";
 import { apiJson } from "@/lib/api";
 import { db, WebsiteArticles } from "@/lib/db";
 
-export const dynamic = "force-dynamic";
-
 /**
  * GET /api/articles/:slug — single website_article by slug, including the
  * fullStory body. Returns { error } (404) when the slug is unknown.

src/app/api/articles/route.ts

@@ -2,8 +2,6 @@ import { count, desc } from "drizzle-orm";
 import { apiJson, pagination } from "@/lib/api";
 import { db, WebsiteArticles } from "@/lib/db";
 
-export const dynamic = "force-dynamic";
-
 /**
  * GET /api/articles — paginated list of website_articles, newest first.
  * Mirrors the /news page query. Returns list cards (shortStory only, never