feat: implement backend API clients for multi-marketplace integration and frontend service layer

backend/lamoda_api/services/orders.py

@@ -0,0 +1,22 @@
+from typing import Dict, Any, List
+from ..client import LamodaClient
+
+class OrdersService:
+    """Service to handle Lamoda Orders (FBS)."""
+    
+    def __init__(self, client: LamodaClient):
+        self.client = client
+
+    def get_new_orders(self, limit: int = 100) -> Dict[str, Any]:
+        """
+        Get list of new orders (assembly tasks).
+        Endpoint: /v1/orders/new
+        """
+        return self.client.get("/v1/orders/new", params={"limit": limit})
+
+    def confirm_packaging(self, order_ids: List[str]) -> Dict[str, Any]:
+        """
+        Confirm that orders are packaged and ready for dispatch.
+        Endpoint: /v1/orders/pack
+        """
+        return self.client.post("/v1/orders/pack", data={"order_ids": order_ids})