v0.0.23 | NHN Cloud 프로젝트에 dns_appkey 필드 추가

- NHNCloudProject 모델에 dns_appkey 필드 추가
- 프로젝트 CRUD API에서 dns_appkey 처리

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

users/migrations/0011_add_dns_appkey_to_nhncloudproject.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.14 on 2026-01-14 15:18
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0010_nhncloudproject'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='nhncloudproject',
+            name='dns_appkey',
+            field=models.CharField(blank=True, max_length=64, null=True, verbose_name='DNS Plus Appkey'),
+        ),
+    ]