Implement assessment delete service method and endpoint

apps/api/src/services/assessments.ts

@@ -39,4 +39,12 @@ export class AssessmentsService {
             .$if(opt.offset !== undefined, (qb) => qb.offset(opt.offset!))
             .execute();
     }
+
+    async delete(id: string, accountId: string): Promise<boolean> {
+        const result = await db.deleteFrom("assessments")
+            .where("id", "=", id)
+            .where("account_id", "=", accountId)
+            .executeTakeFirst();
+        return result.numDeletedRows > 0n;
+    }
 }