feat: added "last-modified" header to supported record types (#1379)

* fixed type error

* exposed created/updated timestamps to shopping list schema

* added custom route to mix in "last-modified" header when available in CRUD routes

* mixed in MealieCrudRoute to APIRouters

* added HEAD route for shopping lists/list-items

* replaced default serializer with FastAPI's

mealie/schema/group/group_shopping_list.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
-from typing import Optional
+from datetime import datetime
+from typing import Optional, Union
 
 from pydantic import UUID4
 
@@ -38,6 +39,9 @@ class ShoppingListItemCreate(MealieModel):
     label_id: Optional[UUID4] = None
     recipe_references: list[ShoppingListItemRecipeRef] = []
 
+    created_at: Optional[datetime]
+    update_at: Optional[datetime]
+
 
 class ShoppingListItemUpdate(ShoppingListItemCreate):
     id: UUID4
@@ -45,7 +49,7 @@ class ShoppingListItemUpdate(ShoppingListItemCreate):
 
 class ShoppingListItemOut(ShoppingListItemUpdate):
     label: Optional[MultiPurposeLabelSummary]
-    recipe_references: list[ShoppingListItemRecipeRefOut] = []
+    recipe_references: list[Union[ShoppingListItemRecipeRef, ShoppingListItemRecipeRefOut]] = []
 
     class Config:
         orm_mode = True
@@ -54,6 +58,9 @@ class ShoppingListItemOut(ShoppingListItemUpdate):
 class ShoppingListCreate(MealieModel):
     name: str = None
 
+    created_at: Optional[datetime]
+    update_at: Optional[datetime]
+
 
 class ShoppingListRecipeRefOut(MealieModel):
     id: UUID4