refactor: update services, alembic, scripts to use module imports

Update remaining application code to use canonical module locations:
- app/services/letzshop/order_service.py
- app/services/platform_health_service.py
- alembic/env.py (inventory and order models)
- scripts/investigate_order.py, verify_setup.py, seed_demo.py

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

alembic/env.py

@@ -125,7 +125,7 @@ except ImportError as e:
 # INVENTORY MODEL
 # ----------------------------------------------------------------------------
 try:
-    from models.database.inventory import Inventory
+    from app.modules.inventory.models import Inventory
 
     print("  ✓ Inventory model imported")
 except ImportError as e:
@@ -168,7 +168,7 @@ except ImportError as e:
 # ORDER MODELS
 # ----------------------------------------------------------------------------
 try:
-    from models.database.order import Order, OrderItem
+    from app.modules.orders.models import Order, OrderItem
 
     print("  ✓ Order models imported (2 models)")
     print("    - Order")

app/services/letzshop/order_service.py

@@ -23,7 +23,7 @@ from models.database.letzshop import (
     VendorLetzshopCredentials,
 )
 from models.database.marketplace_import_job import MarketplaceImportJob
-from models.database.order import Order, OrderItem
+from app.modules.orders.models import Order, OrderItem
 from models.database.product import Product
 from models.database.vendor import Vendor
 

app/services/platform_health_service.py

@@ -17,8 +17,8 @@ from sqlalchemy import func, text
 from sqlalchemy.orm import Session
 
 from app.services.image_service import image_service
-from models.database.inventory import Inventory
-from models.database.order import Order
+from app.modules.inventory.models import Inventory
+from app.modules.orders.models import Order
 from models.database.product import Product
 from models.database.vendor import Vendor
 

scripts/investigate_order.py

@@ -5,7 +5,7 @@ import sys
 sys.path.insert(0, ".")
 
 from app.core.database import SessionLocal
-from models.database.order import Order, OrderItem
+from app.modules.orders.models import Order, OrderItem
 
 
 def investigate_order(order_number: str):

scripts/seed_demo.py

@@ -60,7 +60,7 @@ from models.database.marketplace_product import MarketplaceProduct
 from models.database.marketplace_product_translation import (
     MarketplaceProductTranslation,
 )
-from models.database.order import Order, OrderItem
+from app.modules.orders.models import Order, OrderItem
 from models.database.product import Product
 from models.database.user import User
 from models.database.vendor import Role, Vendor, VendorUser

scripts/verify_setup.py

@@ -143,7 +143,7 @@ def verify_model_structure():
         )
 
         # Import specific models
-        from models.database.inventory import Inventory
+        from app.modules.inventory.models import Inventory
         from models.database.marketplace_import_job import MarketplaceImportJob
         from models.database.marketplace_product import MarketplaceProduct
         from models.database.product import Product