refactor: migrate modules from re-exports to canonical implementations

Move actual code implementations into module directories:
- orders: 5 services, 4 models, order/invoice schemas
- inventory: 3 services, 2 models, 30+ schemas
- customers: 3 services, 2 models, customer schemas
- messaging: 3 services, 2 models, message/notification schemas
- monitoring: background_tasks_service
- marketplace: 5+ services including letzshop submodule
- dev_tools: code_quality_service, test_runner_service
- billing: billing_service
- contracts: definition.py

Legacy files in app/services/, models/database/, models/schema/
now re-export from canonical module locations for backwards
compatibility. Architecture validator passes with 0 errors.

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

app/modules/orders/schemas/__init__.py

@@ -2,34 +2,133 @@
 """
 Orders module Pydantic schemas.
 
-Re-exports order-related schemas from their source locations.
+This module contains the canonical implementations of order-related schemas.
 """
 
-from models.schema.order import (
-    OrderCreate,
-    OrderItemCreate,
-    OrderResponse,
-    OrderItemResponse,
-    OrderListResponse,
+from app.modules.orders.schemas.order import (
+    # Address schemas
     AddressSnapshot,
+    AddressSnapshotResponse,
+    # Order item schemas
+    OrderItemCreate,
+    OrderItemExceptionBrief,
+    OrderItemResponse,
+    # Customer schemas
     CustomerSnapshot,
+    CustomerSnapshotResponse,
+    # Order CRUD schemas
+    OrderCreate,
+    OrderUpdate,
+    OrderTrackingUpdate,
+    OrderItemStateUpdate,
+    # Order response schemas
+    OrderResponse,
+    OrderDetailResponse,
+    OrderListResponse,
+    OrderListItem,
+    # Admin schemas
+    AdminOrderItem,
+    AdminOrderListResponse,
+    AdminOrderStats,
+    AdminOrderStatusUpdate,
+    AdminVendorWithOrders,
+    AdminVendorsWithOrdersResponse,
+    # Letzshop schemas
+    LetzshopOrderImport,
+    LetzshopShippingInfo,
+    LetzshopOrderConfirmItem,
+    LetzshopOrderConfirmRequest,
+    # Shipping schemas
+    MarkAsShippedRequest,
+    ShippingLabelInfo,
 )
-from models.schema.invoice import (
+
+from app.modules.orders.schemas.invoice import (
+    # Invoice settings schemas
+    VendorInvoiceSettingsCreate,
+    VendorInvoiceSettingsUpdate,
+    VendorInvoiceSettingsResponse,
+    # Line item schemas
+    InvoiceLineItem,
+    InvoiceLineItemResponse,
+    # Address schemas
+    InvoiceSellerDetails,
+    InvoiceBuyerDetails,
+    # Invoice CRUD schemas
+    InvoiceCreate,
+    InvoiceManualCreate,
     InvoiceResponse,
+    InvoiceListResponse,
+    InvoiceStatusUpdate,
+    # Pagination
+    InvoiceListPaginatedResponse,
+    # PDF
+    InvoicePDFGeneratedResponse,
+    InvoiceStatsResponse,
+    # Backward compatibility
     InvoiceSettingsCreate,
     InvoiceSettingsUpdate,
     InvoiceSettingsResponse,
 )
 
 __all__ = [
-    "OrderCreate",
-    "OrderItemCreate",
-    "OrderResponse",
-    "OrderItemResponse",
-    "OrderListResponse",
+    # Address schemas
     "AddressSnapshot",
+    "AddressSnapshotResponse",
+    # Order item schemas
+    "OrderItemCreate",
+    "OrderItemExceptionBrief",
+    "OrderItemResponse",
+    # Customer schemas
     "CustomerSnapshot",
+    "CustomerSnapshotResponse",
+    # Order CRUD schemas
+    "OrderCreate",
+    "OrderUpdate",
+    "OrderTrackingUpdate",
+    "OrderItemStateUpdate",
+    # Order response schemas
+    "OrderResponse",
+    "OrderDetailResponse",
+    "OrderListResponse",
+    "OrderListItem",
+    # Admin schemas
+    "AdminOrderItem",
+    "AdminOrderListResponse",
+    "AdminOrderStats",
+    "AdminOrderStatusUpdate",
+    "AdminVendorWithOrders",
+    "AdminVendorsWithOrdersResponse",
+    # Letzshop schemas
+    "LetzshopOrderImport",
+    "LetzshopShippingInfo",
+    "LetzshopOrderConfirmItem",
+    "LetzshopOrderConfirmRequest",
+    # Shipping schemas
+    "MarkAsShippedRequest",
+    "ShippingLabelInfo",
+    # Invoice settings schemas
+    "VendorInvoiceSettingsCreate",
+    "VendorInvoiceSettingsUpdate",
+    "VendorInvoiceSettingsResponse",
+    # Line item schemas
+    "InvoiceLineItem",
+    "InvoiceLineItemResponse",
+    # Invoice address schemas
+    "InvoiceSellerDetails",
+    "InvoiceBuyerDetails",
+    # Invoice CRUD schemas
+    "InvoiceCreate",
+    "InvoiceManualCreate",
     "InvoiceResponse",
+    "InvoiceListResponse",
+    "InvoiceStatusUpdate",
+    # Pagination
+    "InvoiceListPaginatedResponse",
+    # PDF
+    "InvoicePDFGeneratedResponse",
+    "InvoiceStatsResponse",
+    # Backward compatibility
     "InvoiceSettingsCreate",
     "InvoiceSettingsUpdate",
     "InvoiceSettingsResponse",