Add is_admin field to User model and update related serializers and views

api/migrations/0016_user_is_admin.py

@@ -0,0 +1,17 @@
+# Generated by Django 5.2 on 2025-06-09 06:47
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("api", "0015_user_created_at_user_updated_at_temporaryuser"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="user",
+            name="is_admin",
+            field=models.BooleanField(default=False),
+        ),
+    ]