chore: commit pending ZXDB explorer changes prior to index perf work

Context
- Housekeeping commit to capture all current ZXDB Explorer work before index-page performance optimizations.

Includes
- Server-rendered entry detail page with ISR and parallelized DB queries.
- Node runtime for ZXDB API routes and params validation updates for Next 15.
- ZXDB repository extensions (facets, label queries, category queries).
- Cross-linking and Link-based prefetch across ZXDB UI.
- Cache headers on low-churn list APIs.

Notes
- Follow-up commit will focus specifically on speeding up index pages via SSR initial data and ISR.

Signed-off-by: Junie@lucy.xalior.com

src/app/zxdb/languages/[id]/page.tsx

@@ -1,8 +1,12 @@
 import LanguageDetailClient from "./LanguageDetail";
+import { entriesByLanguage } from "@/server/repo/zxdb";
 
 export const metadata = { title: "ZXDB Language" };
 
+export const revalidate = 3600;
+
 export default async function Page({ params }: { params: Promise<{ id: string }> }) {
   const { id } = await params;
-  return <LanguageDetailClient id={id} />;
+  const initial = await entriesByLanguage(id, 1, 20);
+  return <LanguageDetailClient id={id} initial={initial as any} />;
 }