Colecciones
Listar colecciones
GET /api/v1/catalog/collections
Crear colección
POST /api/v1/catalog/collections
{ "title": "Verano 2026", "slug": "verano-2026", "description": "..." }
Obtener / Actualizar / Eliminar
GET|PUT|DELETE /api/v1/catalog/collections/:id
Productos en colección
GET /api/v1/catalog/collections/:id/productsPOST /api/v1/catalog/collections/:id/products—{ "product_id": "uuid" }DELETE /api/v1/catalog/collections/:id/products/:product_id