Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

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

@@ -7,10 +7,7 @@ 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.
  */
-export async function GET(
-  _req: Request,
-  { params }: { params: Promise<{ slug: string }> },
-) {
+export async function GET(_req: Request, { params }: { params: Promise<{ slug: string }> }) {
   const { slug } = await params;
 
   try {