feat(purchase/): add purchase app

purchase/admin.py

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+from django.contrib import admin
+
+# Register your models here.

purchase/apps.py

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+from django.apps import AppConfig
+
+
+class PurchaseConfig(AppConfig):
+    name = 'purchase'

purchase/migrations/0001_initial.py

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+# Generated by Django 6.0.3 on 2026-03-19 17:36
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('home', '0019_coursepage_description'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CoursePurchase',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('purchased_at', models.DateTimeField(auto_now_add=True)),
+                ('refunded', models.BooleanField(default=False)),
+                ('course', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='home.coursepage')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+    ]

purchase/models.py

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+from django.db import models
+from django.conf import settings
+
+
+class CoursePurchase(models.Model):
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
+    course = models.ForeignKey("home.CoursePage", on_delete=models.CASCADE)
+    purchased_at = models.DateTimeField(auto_now_add=True)
+    refunded = models.BooleanField(default=False)

purchase/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

purchase/views.py

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+from django.shortcuts import render
+
+# Create your views here.