feat(shopping): refonte UX + CRUD catalogue/boutiques + champs enrichis

- UX : vue par défaut = liste en cours, landing si pas de liste (+ vert +
  baguette magique), suppression des vues "listes" et "mode magasin" séparés
- Articles cochés barrés et déplacés en bas, tri alphabétique par section
- Nom de liste auto avec numéro de semaine ISO (S21 2026)
- Wake lock activé dès qu'une liste est ouverte
- CRUD boutiques : POST/PATCH/DELETE /stores + modal Boutiques
- CRUD articles : POST/PATCH/DELETE /products + modal Catalogue
- Champs enrichis produits : description, prix, quantité/unité, boutique défaut
- Champs enrichis boutiques : url, store_type (alimentaire, bricolage…)
- Migration 003 : nouveaux champs en base

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/schemas/shopping.py

@@ -5,11 +5,51 @@ from typing import Literal
 from pydantic import BaseModel, ConfigDict, model_validator
 
 
+class StoreCreate(BaseModel):
+    name: str
+    location: str | None = None
+    url: str | None = None
+    store_type: str | None = None
+
+
+class StoreUpdate(BaseModel):
+    name: str | None = None
+    location: str | None = None
+    url: str | None = None
+    store_type: str | None = None
+
+
 class StoreResponse(BaseModel):
     model_config = ConfigDict(from_attributes=True)
     id: uuid.UUID
     name: str
     location: str | None
+    url: str | None
+    store_type: str | None
+
+
+class ProductCreate(BaseModel):
+    name: str
+    brand: str | None = None
+    category: str | None = None
+    description: str | None = None
+    default_unit: str | None = None
+    barcode: str | None = None
+    price: Decimal | None = None
+    quantity_per_unit: Decimal | None = None
+    default_store_id: uuid.UUID | None = None
+
+
+class ProductUpdate(BaseModel):
+    name: str | None = None
+    brand: str | None = None
+    category: str | None = None
+    description: str | None = None
+    default_unit: str | None = None
+    barcode: str | None = None
+    price: Decimal | None = None
+    quantity_per_unit: Decimal | None = None
+    default_store_id: uuid.UUID | None = None
 
 
 class ProductResponse(BaseModel):
@@ -18,7 +58,12 @@ class ProductResponse(BaseModel):
     name: str
     brand: str | None
     category: str | None
+    description: str | None
     default_unit: str | None
+    barcode: str | None
+    price: Decimal | None
+    quantity_per_unit: Decimal | None
+    default_store_id: uuid.UUID | None
     frequency_score: int