feat: add catalogue image management (#1)

- Add CatalogueImage model with FK to Product
- Add image resize service (strict/non-strict modes with configurable dimensions)
- Add CRUD API endpoints with admin-only write permissions
- Add catalogue_images field to product listing/detail endpoints
- Serve media files in development via static()
- 28 TDD tests covering model, API, permissions, resize, and product listing

tienda_ilusion/don_confiao/urls.py

@@ -3,6 +3,8 @@ from rest_framework.routers import DefaultRouter
 
 from . import views
 from .api import (
+    # Catalogue Images
+    CatalogueImageViewSet,
     # Products
     ProductView,
     ProductsFromTrytonView,
@@ -33,6 +35,11 @@ router.register(r"sales", SaleView, basename="sale")
 router.register(r"catalog_sales", CatalogSaleView, basename="catalog_sale")
 router.register(r"customers", CustomerView, basename="customer")
 router.register(r"products", ProductView, basename="product")
+router.register(
+    r"catalogue_images",
+    CatalogueImageViewSet,
+    basename="catalogue_image",
+)
 router.register(
     r"reconciliate_jar",
     ReconciliateJarModelView,