Remove item management feature from frontend and backend, and add a pending skeleton component.

backend/app/crud.py

@@ -5,8 +5,6 @@ from sqlmodel import Session, select
 
 from app.core.security import get_password_hash, verify_password
 from app.models import (
-    Item,
-    ItemCreate,
     Location,
     LocationCreate,
     User,
@@ -68,14 +66,6 @@ def authenticate(*, session: Session, email: str, password: str) -> User | None:
     return db_user
 
 
-def create_item(*, session: Session, item_in: ItemCreate, owner_id: uuid.UUID) -> Item:
-    db_item = Item.model_validate(item_in, update={"owner_id": owner_id})
-    session.add(db_item)
-    session.commit()
-    session.refresh(db_item)
-    return db_item
-
-
 def create_location(*, session: Session, location_in: LocationCreate, owner_id: uuid.UUID) -> Location:
     db_location = Location.model_validate(location_in, update={"owner_id": owner_id})
     session.add(db_location)