Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/api/articles/route.ts

@@ -41,9 +41,6 @@ export async function GET(req: Request) {
     });
   } catch {
     // DB unavailable — return an empty payload instead of a 500.
-    return apiJson(
-      { data: [], meta: { page, perPage, total: 0, lastPage: 1 } },
-      { status: 200 },
-    );
+    return apiJson({ data: [], meta: { page, perPage, total: 0, lastPage: 1 } }, { status: 200 });
   }
 }