Updated storage logic to use a key and presignedurl

prisma/schema.prisma

@@ -22,6 +22,7 @@ model CaseLaw {
   court        String?
   caseNumber   String?
   summary      String?   @db.Text
+  storageKey   String?
   fileType     String
   createdAt    DateTime  @default(now())
   updatedAt    DateTime  @updatedAt

src/cases/entities/case-law.entity.ts

@@ -26,6 +26,9 @@ export class CaseLaw {
   @Field({ nullable: true })
   summary?: string;
 
+  // Internal storage key — not exposed directly via GraphQL.
+  storageKey?: string;
+
   @Field()
   fileType: string;