feat: add metadata generator for remaining books

app/books/kb/page.tsx

@@ -1,6 +1,8 @@
+import type { Metadata } from "next";
 import Link from "next/link";
 import { notFound } from "next/navigation";
 import { getBookMeta } from "@/lib/api";
+import { ogForBook } from "@/lib/og";
 import { PageHeader } from "@/components/page-header";
 import { Card, CardContent } from "@/components/ui/card";
 import { Badge } from "@/components/ui/badge";
@@ -10,6 +12,10 @@ type VolumeInfo = {
   totalChapters: number;
 };
 
+export function generateMetadata(): Metadata {
+  return ogForBook("kb");
+}
+
 export default async function KbPage() {
   const meta = await getBookMeta("kb");
   if (!meta) notFound();