refactor: delete legacy models/schema/cart.py

No remaining imports from legacy location - safe to delete.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

models/schema/cart.py

@@ -1,27 +0,0 @@
-# models/schema/cart.py
-"""
-LEGACY LOCATION - This file re-exports from the canonical module location.
-
-Canonical location: app/modules/cart/schemas/
-
-This file exists for backward compatibility. New code should import from:
-    from app.modules.cart.schemas import CartResponse, AddToCartRequest
-"""
-
-from app.modules.cart.schemas.cart import (
-    AddToCartRequest,
-    UpdateCartItemRequest,
-    CartItemResponse,
-    CartResponse,
-    CartOperationResponse,
-    ClearCartResponse,
-)
-
-__all__ = [
-    "AddToCartRequest",
-    "UpdateCartItemRequest",
-    "CartItemResponse",
-    "CartResponse",
-    "CartOperationResponse",
-    "ClearCartResponse",
-]