feat(integrations): добавлена заготовка интеграции Recommerce

- Создана структура marketplaces/ для маркетплейсов
- Модели: MarketplaceIntegration, WooCommerceIntegration, RecommerceIntegration
- Сервисы: MarketplaceService, WooCommerceService, RecommerceService
- RecommerceService содержит методы для работы с API:
  - test_connection(), sync(), fetch_products()
  - push_product(), update_stock(), update_price()
- IntegrationConfig обновлён с новой интеграцией

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

myproject/integrations/models/marketplaces/woocommerce.py

@@ -0,0 +1,40 @@
+from django.db import models
+from .base import MarketplaceIntegration
+
+
+class WooCommerceIntegration(MarketplaceIntegration):
+    """Интеграция с WooCommerce"""
+
+    # WooCommerce-specific credentials
+    consumer_key = models.CharField(
+        max_length=255,
+        blank=True,
+        verbose_name="Consumer Key"
+    )
+
+    consumer_secret = models.CharField(
+        max_length=255,
+        blank=True,
+        verbose_name="Consumer Secret"
+    )
+
+    # API версия (WooCommerce REST API v1, v2, v3)
+    api_version = models.CharField(
+        max_length=10,
+        default='v3',
+        blank=True,
+        verbose_name="Версия API"
+    )
+
+    class Meta:
+        verbose_name = "WooCommerce"
+        verbose_name_plural = "WooCommerce"
+        managed = False  # Пока заготовка - без создания таблицы
+
+    def __str__(self):
+        return f"WooCommerce: {self.name or self.store_url}"
+
+    @property
+    def is_configured(self) -> bool:
+        """WooCommerce требует consumer_key и consumer_secret"""
+        return bool(self.consumer_key and self.consumer_secret)