add problem answers

problem/migrations/0003_problem_answers.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.3 on 2025-10-03 16:56
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('problem', '0002_problem_prompt'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='problem',
+            name='answers',
+            field=models.JSONField(null=True),
+        ),
+    ]