refactor: move letzshop endpoints to marketplace module and add vendor service tests

Move letzshop-related functionality from tenancy to marketplace module:
- Move admin letzshop routes to marketplace/routes/api/admin_letzshop.py
- Move letzshop schemas to marketplace/schemas/letzshop.py
- Remove letzshop code from tenancy module (admin_vendors, vendor_service)
- Update model exports and imports

Add comprehensive unit tests for vendor services:
- test_company_service.py: Company management operations
- test_platform_service.py: Platform management operations
- test_vendor_domain_service.py: Vendor domain operations
- test_vendor_team_service.py: Vendor team management

Update module definitions:
- billing, messaging, payments: Minor definition updates

Add architecture proposals documentation:
- Module dependency redesign session notes
- Decouple modules implementation plan
- Module decoupling proposal

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

tests/unit/services/test_vendor_service.py

@@ -1,5 +1,9 @@
 # tests/unit/services/test_vendor_service.py
-"""Unit tests for VendorService following the application's exception patterns."""
+"""Unit tests for VendorService following the application's exception patterns.
+
+Note: Product catalog operations (add_product_to_catalog, get_products) have been
+moved to app.modules.catalog.services. See test_product_service.py for those tests.
+"""
 
 import uuid
 
@@ -12,12 +16,9 @@ from app.modules.tenancy.exceptions import (
     VendorAlreadyExistsException,
     VendorNotFoundException,
 )
-from app.modules.marketplace.exceptions import MarketplaceProductNotFoundException
-from app.modules.catalog.exceptions import ProductAlreadyExistsException
 from app.modules.tenancy.services.vendor_service import VendorService
 from app.modules.tenancy.models import Company
 from app.modules.tenancy.models import Vendor
-from app.modules.catalog.schemas import ProductCreate
 from app.modules.tenancy.schemas.vendor import VendorCreate
 
 
@@ -354,98 +355,8 @@ class TestVendorService:
 
         assert vendor.is_active is False
 
-    # ==================== add_product_to_catalog Tests ====================
-
-    def test_add_product_to_vendor_success(self, db, test_vendor, unique_product):
-        """Test successfully adding product to vendor."""
-        from app.modules.marketplace.models import MarketplaceProduct
-
-        # Re-query objects to avoid session issues
-        vendor = db.query(Vendor).filter(Vendor.id == test_vendor.id).first()
-        mp = (
-            db.query(MarketplaceProduct)
-            .filter(MarketplaceProduct.id == unique_product.id)
-            .first()
-        )
-
-        product_data = ProductCreate(
-            marketplace_product_id=mp.id,
-            price=15.99,
-            is_featured=True,
-        )
-
-        product = self.service.add_product_to_catalog(db, vendor, product_data)
-        db.commit()
-
-        assert product is not None
-        assert product.vendor_id == vendor.id
-        assert product.marketplace_product_id == mp.id
-
-    def test_add_product_to_vendor_product_not_found(self, db, test_vendor):
-        """Test adding non-existent product to vendor fails."""
-        product_data = ProductCreate(
-            marketplace_product_id=99999,  # Non-existent ID
-            price=15.99,
-        )
-
-        with pytest.raises(MarketplaceProductNotFoundException) as exc_info:
-            self.service.add_product_to_catalog(db, test_vendor, product_data)
-
-        exception = exc_info.value
-        assert exception.status_code == 404
-        assert exception.error_code == "PRODUCT_NOT_FOUND"
-
-    def test_add_product_to_vendor_already_exists(self, db, test_vendor, test_product):
-        """Test adding product that's already in vendor fails."""
-        # Re-query to get fresh instances
-        from app.modules.catalog.models import Product
-
-        vendor = db.query(Vendor).filter(Vendor.id == test_vendor.id).first()
-        product = db.query(Product).filter(Product.id == test_product.id).first()
-
-        product_data = ProductCreate(
-            marketplace_product_id=product.marketplace_product_id,
-            price=15.99,
-        )
-
-        with pytest.raises(ProductAlreadyExistsException) as exc_info:
-            self.service.add_product_to_catalog(db, vendor, product_data)
-
-        exception = exc_info.value
-        assert exception.status_code == 409
-        assert exception.error_code == "PRODUCT_ALREADY_EXISTS"
-
-    # ==================== get_products Tests ====================
-
-    def test_get_products_owner_access(self, db, test_user, test_vendor, test_product):
-        """Test vendor owner can get vendor products."""
-        # Re-query vendor to get fresh instance
-        vendor = db.query(Vendor).filter(Vendor.id == test_vendor.id).first()
-        products, total = self.service.get_products(db, vendor, test_user)
-
-        assert total >= 1
-        assert len(products) >= 1
-
-    def test_get_products_access_denied(self, db, test_user, inactive_vendor):
-        """Test non-owner cannot access unverified vendor products."""
-        # Re-query vendor to get fresh instance
-        vendor = db.query(Vendor).filter(Vendor.id == inactive_vendor.id).first()
-        with pytest.raises(UnauthorizedVendorAccessException) as exc_info:
-            self.service.get_products(db, vendor, test_user)
-
-        exception = exc_info.value
-        assert exception.status_code == 403
-        assert exception.error_code == "UNAUTHORIZED_VENDOR_ACCESS"
-
-    def test_get_products_with_filters(self, db, test_user, test_vendor, test_product):
-        """Test getting vendor products with various filters."""
-        # Re-query vendor to get fresh instance
-        vendor = db.query(Vendor).filter(Vendor.id == test_vendor.id).first()
-        # Test active only filter
-        products, total = self.service.get_products(
-            db, vendor, test_user, active_only=True
-        )
-        assert all(p.is_active for p in products)
+    # NOTE: add_product_to_catalog and get_products tests have been moved to
+    # test_product_service.py since those methods are now in the catalog module.
 
     # ==================== Helper Method Tests ====================