fix: update letzshop API to use unified Order model properties

- Change message exceptions (MessageAttachmentException,
  InvalidConversationTypeException, InvalidRecipientTypeException)
  to extend BusinessLogicException instead of ValidationException
  which doesn't accept error_code parameter

- Update vendor letzshop API endpoints:
  - Change sync_status query param to status in list_orders()
  - Fix response mapping to use unified Order model properties
    (external_order_id, external_shipment_id, status, etc.)
  - Fix confirm_order() to get inventory unit IDs from order items
  - Fix set_tracking() to use external_shipment_id

- Add order_date to test fixtures (required NOT NULL field)

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

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

tests/integration/api/v1/admin/test_letzshop.py

@@ -246,6 +246,8 @@ class TestAdminLetzshopOrdersAPI:
 
     def test_list_vendor_orders_with_data(self, client, db, admin_headers, test_vendor):
         """Test listing vendor orders with data."""
+        from datetime import datetime, timezone
+
         from models.database.order import Order
 
         # Create test order using unified Order model with all required fields
@@ -256,6 +258,7 @@ class TestAdminLetzshopOrdersAPI:
             channel="letzshop",
             external_order_id="admin_order_1",
             status="pending",
+            order_date=datetime.now(timezone.utc),
             customer_first_name="Admin",
             customer_last_name="Test",
             customer_email="admin-test@example.com",

tests/integration/api/v1/vendor/test_letzshop.py

@@ -238,6 +238,8 @@ class TestVendorLetzshopOrdersAPI:
         self, client, db, vendor_user_headers, test_vendor_with_vendor_user
     ):
         """Test listing orders with status filter."""
+        from datetime import datetime, timezone
+
         from models.database.order import Order
 
         # Create test orders using unified Order model with all required fields
@@ -248,6 +250,7 @@ class TestVendorLetzshopOrdersAPI:
             channel="letzshop",
             external_order_id="order_1",
             status="pending",
+            order_date=datetime.now(timezone.utc),
             customer_first_name="Test",
             customer_last_name="User",
             customer_email="test1@example.com",
@@ -273,6 +276,7 @@ class TestVendorLetzshopOrdersAPI:
             channel="letzshop",
             external_order_id="order_2",
             status="processing",
+            order_date=datetime.now(timezone.utc),
             customer_first_name="Test",
             customer_last_name="User",
             customer_email="test2@example.com",
@@ -309,6 +313,8 @@ class TestVendorLetzshopOrdersAPI:
         self, client, db, vendor_user_headers, test_vendor_with_vendor_user
     ):
         """Test getting order detail."""
+        from datetime import datetime, timezone
+
         from models.database.order import Order
 
         order = Order(
@@ -319,6 +325,7 @@ class TestVendorLetzshopOrdersAPI:
             external_order_id="order_detail_test",
             external_shipment_id="shipment_1",
             status="pending",
+            order_date=datetime.now(timezone.utc),
             customer_first_name="Test",
             customer_last_name="User",
             customer_email="test@example.com",
@@ -448,6 +455,8 @@ class TestVendorLetzshopFulfillmentAPI:
         test_vendor_with_vendor_user,
     ):
         """Test confirming an order."""
+        from datetime import datetime, timezone
+
         from models.database.order import Order, OrderItem
 
         # Create test order using unified Order model with all required fields
@@ -459,6 +468,7 @@ class TestVendorLetzshopFulfillmentAPI:
             external_order_id="order_confirm",
             external_shipment_id="shipment_1",
             status="pending",
+            order_date=datetime.now(timezone.utc),
             customer_first_name="Test",
             customer_last_name="User",
             customer_email="test@example.com",
@@ -534,6 +544,8 @@ class TestVendorLetzshopFulfillmentAPI:
         test_vendor_with_vendor_user,
     ):
         """Test setting tracking information."""
+        from datetime import datetime, timezone
+
         from models.database.order import Order
 
         order = Order(
@@ -544,6 +556,7 @@ class TestVendorLetzshopFulfillmentAPI:
             external_order_id="order_tracking",
             external_shipment_id="shipment_track",
             status="processing",  # confirmed state
+            order_date=datetime.now(timezone.utc),
             customer_first_name="Test",
             customer_last_name="User",
             customer_email="test@example.com",