Shopping List Connection SETUP

[staticvoidmainmaui]

We need to come up with the correct specs for shopping list, wether it compares the meals from their ingredients, all ingredients total listed, wether there will be filtering, a checklist, this probably will be more frontend with all the hooks(buttons and reacthandlers) , than backend if we were to simplify it.

Description:
Add a shopping list where users can track grocery items they need to buy. Items can be added manually or generated from meal ingredient missing from their pantry.
Scope

• CRUD endpoints via FastAPI (/shopping-list)
• Firestore storage under users/{uid}/shopping_list
• Frontend page already exists (ShoppingList.tsx) — wire it up to the backend
• Ability to check off purchased items

No external APIs needed — same FastAPI + Firestore pattern as pantry and meals.

[AndrewFesenko]

It also needs to be connected to users