check point, notebook basic structure defined

backend/prisma/migrations/20250409231956_add_image_url/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Article" ADD COLUMN     "imageUrl" TEXT;

backend/prisma/schema.prisma

@@ -35,6 +35,7 @@ model Article {
   updatedAt   DateTime     @updatedAt
   categories  String[]
   authors     String[]
+  imageUrl    String?
   Note        Note[]
 
   @@index([url])