Fix Django migration issues and add missing URLs

- Create missing templates app urls.py
- Fix REST_FRAMEWORK pagination settings
- Add DEFAULT_AUTO_FIELD configuration
- Create migration files for all apps
- Fix auto-generated model warnings
- Verify database setup with test project

backend/apps/templates/migrations/0001_initial.py

@@ -0,0 +1,44 @@
+# Generated by Django 5.1.4 on 2026-05-31 07:59
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CardTemplate',
+            fields=[
+                ('id', models.CharField(max_length=50, primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=100)),
+                ('description', models.TextField()),
+                ('preview_image', models.ImageField(null=True, upload_to='templates/previews/')),
+                ('color_spade', models.CharField(default='#000000', max_length=20)),
+                ('color_heart', models.CharField(default='#FF0000', max_length=20)),
+                ('color_club', models.CharField(default='#000000', max_length=20)),
+                ('color_diamond', models.CharField(default='#FF0000', max_length=20)),
+                ('color_background', models.CharField(default='#FFFFFF', max_length=20)),
+                ('default_assets', models.JSONField(default=dict)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+            ],
+            options={
+                'ordering': ['name'],
+            },
+        ),
+        migrations.CreateModel(
+            name='SuitSymbol',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('suit_name', models.CharField(max_length=20)),
+                ('svg_path', models.TextField()),
+                ('color', models.CharField(max_length=20)),
+                ('template', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='suit_symbols', to='templates.cardtemplate')),
+            ],
+        ),
+    ]

backend/apps/templates/urls.py

@@ -0,0 +1,9 @@
+from django.urls import path
+from .views import template_list, template_detail
+
+app_name = 'templates'
+
+urlpatterns = [
+    path('templates/', template_list, name='template-list'),
+    path('templates/<str:pk>/', template_detail, name='template-detail'),
+]