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/entries/[id]/EntryDetail.tsx

@@ -1,9 +1,9 @@
 "use client";
 
-import { useEffect, useState } from "react";
+import Link from "next/link";
 
 type Label = { id: number; name: string; labeltypeId: string | null };
-type EntryDetail = {
+export type EntryDetailData = {
   id: number;
   title: string;
   isXrated: number;
@@ -14,35 +14,7 @@ type EntryDetail = {
   publishers: Label[];
 };
 
-export default function EntryDetailClient({ id }: { id: number }) {
-  const [data, setData] = useState<EntryDetail | null>(null);
-  const [loading, setLoading] = useState(true);
-  const [error, setError] = useState<string | null>(null);
-
-  useEffect(() => {
-    let aborted = false;
-    async function run() {
-      setLoading(true);
-      setError(null);
-      try {
-        const res = await fetch(`/api/zxdb/entries/${id}`, { cache: "no-store" });
-        if (!res.ok) throw new Error(`Failed: ${res.status}`);
-        const json: EntryDetail = await res.json();
-        if (!aborted) setData(json);
-      } catch (e: any) {
-        if (!aborted) setError(e?.message ?? "Failed to load");
-      } finally {
-        if (!aborted) setLoading(false);
-      }
-    }
-    run();
-    return () => {
-      aborted = true;
-    };
-  }, [id]);
-
-  if (loading) return <div>Loading…</div>;
-  if (error) return <div className="alert alert-danger">{error}</div>;
+export default function EntryDetailClient({ data }: { data: EntryDetailData }) {
   if (!data) return <div className="alert alert-warning">Not found</div>;
 
   return (
@@ -50,19 +22,19 @@ export default function EntryDetailClient({ id }: { id: number }) {
       <div className="d-flex align-items-center gap-2 flex-wrap">
         <h1 className="mb-0">{data.title}</h1>
         {data.genre.name && (
-          <a className="badge text-bg-secondary text-decoration-none" href={`/zxdb/genres/${data.genre.id}`}>
+          <Link className="badge text-bg-secondary text-decoration-none" href={`/zxdb/genres/${data.genre.id}`}>
             {data.genre.name}
-          </a>
+          </Link>
         )}
         {data.language.name && (
-          <a className="badge text-bg-info text-decoration-none" href={`/zxdb/languages/${data.language.id}`}>
+          <Link className="badge text-bg-info text-decoration-none" href={`/zxdb/languages/${data.language.id}`}>
             {data.language.name}
-          </a>
+          </Link>
         )}
         {data.machinetype.name && (
-          <a className="badge text-bg-primary text-decoration-none" href={`/zxdb/machinetypes/${data.machinetype.id}`}>
+          <Link className="badge text-bg-primary text-decoration-none" href={`/zxdb/machinetypes/${data.machinetype.id}`}>
             {data.machinetype.name}
-          </a>
+          </Link>
         )}
         {data.isXrated ? <span className="badge text-bg-danger">18+</span> : null}
       </div>
@@ -77,7 +49,7 @@ export default function EntryDetailClient({ id }: { id: number }) {
             <ul className="list-unstyled mb-0">
               {data.authors.map((a) => (
                 <li key={a.id}>
-                  <a href={`/zxdb/labels/${a.id}`}>{a.name}</a>
+                  <Link href={`/zxdb/labels/${a.id}`}>{a.name}</Link>
                 </li>
               ))}
             </ul>
@@ -90,7 +62,7 @@ export default function EntryDetailClient({ id }: { id: number }) {
             <ul className="list-unstyled mb-0">
               {data.publishers.map((p) => (
                 <li key={p.id}>
-                  <a href={`/zxdb/labels/${p.id}`}>{p.name}</a>
+                  <Link href={`/zxdb/labels/${p.id}`}>{p.name}</Link>
                 </li>
               ))}
             </ul>
@@ -101,8 +73,8 @@ export default function EntryDetailClient({ id }: { id: number }) {
       <hr />
 
       <div className="d-flex align-items-center gap-2">
-        <a className="btn btn-sm btn-outline-secondary" href={`/zxdb/entries/${data.id}`}>Permalink</a>
-        <a className="btn btn-sm btn-outline-primary" href="/zxdb">Back to Explorer</a>
+        <Link className="btn btn-sm btn-outline-secondary" href={`/zxdb/entries/${data.id}`}>Permalink</Link>
+        <Link className="btn btn-sm btn-outline-primary" href="/zxdb">Back to Explorer</Link>
       </div>
     </div>
   );