feat: implement multi-language translation support for products

- Add database migrations for translation tables and digital product fields
- Create MarketplaceProductTranslation model for localized content
- Create ProductTranslation model for vendor translation overrides
- Add product type enum (physical, digital, service, subscription)
- Add digital delivery method and platform fields
- Add numeric price fields (price_numeric, sale_price_numeric)
- Implement language fallback pattern (requested -> 'en' -> None)
- Add helper methods: get_title(), get_description(), get_translation()
- Add vendor override pattern with effective_* properties
- Move title/description from products to translations table

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

models/database/__init__.py

@@ -20,9 +20,15 @@ from .content_page import ContentPage
 from .customer import Customer, CustomerAddress
 from .inventory import Inventory
 from .marketplace_import_job import MarketplaceImportJob
-from .marketplace_product import MarketplaceProduct
+from .marketplace_product import (
+    DigitalDeliveryMethod,
+    MarketplaceProduct,
+    ProductType,
+)
+from .marketplace_product_translation import MarketplaceProductTranslation
 from .order import Order, OrderItem
 from .product import Product
+from .product_translation import ProductTranslation
 from .user import User
 from .vendor import Role, Vendor, VendorUser
 from .vendor_domain import VendorDomain
@@ -40,21 +46,35 @@ __all__ = [
     "ArchitectureViolation",
     "ViolationAssignment",
     "ViolationComment",
+    # Base
     "Base",
+    # User & Auth
     "User",
+    # Company & Vendor
     "Company",
-    "ContentPage",
-    "Inventory",
-    "Customer",
-    "CustomerAddress",
-    "Order",
-    "OrderItem",
     "Vendor",
     "VendorUser",
     "Role",
-    "Product",
-    "MarketplaceImportJob",
-    "MarketplaceProduct",
     "VendorDomain",
     "VendorTheme",
+    # Content
+    "ContentPage",
+    # Customer
+    "Customer",
+    "CustomerAddress",
+    # Product - Enums
+    "ProductType",
+    "DigitalDeliveryMethod",
+    # Product - Models
+    "MarketplaceProduct",
+    "MarketplaceProductTranslation",
+    "Product",
+    "ProductTranslation",
+    # Import
+    "MarketplaceImportJob",
+    # Inventory
+    "Inventory",
+    # Orders
+    "Order",
+    "OrderItem",
 ]