feat(orders): add recipient management and enhance order forms

- Introduced Recipient model to manage order recipients separately from customers.
- Updated Order model to link to Recipient, replacing recipient_name and recipient_phone fields.
- Enhanced OrderForm to include recipient selection modes: customer, history, and new.
- Added AJAX endpoint to fetch recipient history for customers.
- Updated admin interface to manage recipients and display recipient information in order details.
- Refactored address handling to accommodate new recipient logic.
- Improved demo order creation to include random recipients.

myproject/orders/models/__init__.py

@@ -4,6 +4,7 @@
 Структура:
 - OrderStatus: Статусы заказов
 - Address: Адреса доставки
+- Recipient: Получатели заказов
 - Order: Главная модель заказа
 - OrderItem: Позиции в заказе
 - PaymentMethod: Способы оплаты (справочник)
@@ -17,6 +18,7 @@ from .payment_method import PaymentMethod
 
 # 2. Модели с зависимостями от справочников
 from .address import Address
+from .recipient import Recipient
 
 # 3. Главная модель Order (зависит от Status, Address)
 from .order import Order
@@ -29,6 +31,7 @@ from .transaction import Transaction
 __all__ = [
     'OrderStatus',
     'Address',
+    'Recipient',
     'Order',
     'OrderItem',
     'PaymentMethod',