Make the house list work

backend/app/dtos/houses_list_response.py

@@ -0,0 +1,12 @@
+from pydantic import BaseModel
+
+class HouseResponse(BaseModel):
+    id: str
+    description: str
+    address: str
+    city: str
+    country: str
+    price: float
+
+class HousesListResponse(BaseModel):
+    houses: list[HouseResponse]