feat: implement order management and checkout functionality

- Added `Order` and `OrderItem` models with migrations for managing orders and their details
- Created `CheckoutForm` for validating order data and customer information
- Built templates for order confirmation, checkout success, and emails (HTML and plain text)
- Added logic for email notifications upon successful order placement
- Enhanced shopping cart template with checkout panel integration
- Updated styles and JavaScript for streamlined checkout UX
- Refactored cart view to support item summaries and final totals during checkout

orders/migrations/0002_order_orderitem.py

@@ -0,0 +1,63 @@
+# Generated by Django 6.0.5 on 2026-05-21 11:58
+
+import django.core.validators
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('items', '0003_subcategory_item_subcategory_and_more'),
+        ('orders', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Order',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('customer_name', models.CharField(max_length=255, verbose_name='ФИО')),
+                ('phone', models.CharField(max_length=32, verbose_name='Телефон')),
+                ('email', models.EmailField(max_length=254, verbose_name='E-mail')),
+                ('delivery_method', models.CharField(choices=[('courier', 'Курьерская доставка'), ('pickup', 'Самовывоз')], default='courier', max_length=16, verbose_name='Способ доставки')),
+                ('region', models.CharField(blank=True, max_length=255, verbose_name='Регион')),
+                ('address', models.CharField(blank=True, max_length=512, verbose_name='Адрес')),
+                ('payment_method', models.CharField(choices=[('card', 'Банковская карта'), ('credit', 'Кредит'), ('installment', 'Рассрочка')], default='card', max_length=16, verbose_name='Способ оплаты')),
+                ('promo_code', models.CharField(blank=True, max_length=64, verbose_name='Промокод')),
+                ('products_total', models.DecimalField(decimal_places=2, max_digits=10, verbose_name='Сумма товаров')),
+                ('discount_total', models.DecimalField(decimal_places=2, default=0, max_digits=10, verbose_name='Скидка')),
+                ('delivery_total', models.DecimalField(decimal_places=2, default=0, max_digits=10, verbose_name='Доставка')),
+                ('floor_lift_total', models.DecimalField(decimal_places=2, default=0, max_digits=10, verbose_name='Подъём на этаж')),
+                ('total', models.DecimalField(decimal_places=2, max_digits=10, verbose_name='Итого к оплате')),
+                ('status', models.CharField(choices=[('paid', 'Оплачен')], default='paid', max_length=16, verbose_name='Статус')),
+                ('created_at', models.DateTimeField(auto_now_add=True, verbose_name='Дата создания')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='orders', to=settings.AUTH_USER_MODEL, verbose_name='Пользователь')),
+            ],
+            options={
+                'verbose_name': 'Заказ',
+                'verbose_name_plural': 'Заказы',
+                'ordering': ('-created_at', '-id'),
+            },
+        ),
+        migrations.CreateModel(
+            name='OrderItem',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('item_name', models.CharField(max_length=255, verbose_name='Название товара')),
+                ('item_slug', models.SlugField(blank=True, verbose_name='URL товара')),
+                ('item_price', models.DecimalField(decimal_places=2, max_digits=10, verbose_name='Цена товара')),
+                ('quantity', models.PositiveIntegerField(validators=[django.core.validators.MinValueValidator(1)], verbose_name='Количество')),
+                ('line_total', models.DecimalField(decimal_places=2, max_digits=10, verbose_name='Сумма строки')),
+                ('item', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='order_entries', to='items.item', verbose_name='Товар')),
+                ('order', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='items', to='orders.order', verbose_name='Заказ')),
+            ],
+            options={
+                'verbose_name': 'Позиция заказа',
+                'verbose_name_plural': 'Позиции заказа',
+                'ordering': ('id',),
+            },
+        ),
+    ]