feat: add not found pages for boards (#1671)

apps/nextjs/src/app/[locale]/(home)/(board)/layout.tsx

@@ -0,0 +1,5 @@
+import definition from "../../boards/(content)/(home)/_definition";
+
+const { layout } = definition;
+
+export default layout;

apps/nextjs/src/app/[locale]/(home)/(board)/page.tsx

@@ -0,0 +1,7 @@
+import definition from "../../boards/(content)/(home)/_definition";
+
+const { generateMetadataAsync: generateMetadata, page } = definition;
+
+export default page;
+
+export { generateMetadata };

apps/nextjs/src/app/[locale]/(home)/not-found.tsx

@@ -0,0 +1,3 @@
+import HomeBoardNotFoundPage from "../boards/(content)/not-found";
+
+export default HomeBoardNotFoundPage;