separated clients handlers, cart->checkout ppline

dto/cart.py

@@ -1,4 +1,5 @@
 from dataclasses import dataclass
+from typing import Optional
 
 
 @dataclass(frozen=True)
@@ -17,3 +18,4 @@ class CartItemDTO:
 class CartDTO:
     items: list[CartItemDTO]
     total: int
+    order_id: Optional[int] = None

dto/checkout.py

@@ -0,0 +1,18 @@
+from dataclasses import dataclass
+from typing import Optional
+
+from aiogram.types import Message
+
+
+@dataclass
+class CheckoutContext:
+    orig_msg: Message
+    order_id: int
+    name: Optional[str] = None
+    phone: Optional[str] = None
+    address: Optional[str] = None
+
+
+@dataclass
+class PaymentContext:
+    notification_msg: Message