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_admin_service.py

@@ -177,65 +177,8 @@ class TestAdminService:
         exception = exc_info.value
         assert exception.error_code == "VENDOR_NOT_FOUND"
 
-    # Marketplace Import Jobs Tests
-    def test_get_marketplace_import_jobs_no_filters(
-        self, db, test_marketplace_import_job
-    ):
-        """Test getting marketplace import jobs without filters"""
-        result = self.service.get_marketplace_import_jobs(db, skip=0, limit=10)
-
-        assert len(result) >= 1
-        # Find our test job in the results
-        test_job = next(
-            (job for job in result if job.job_id == test_marketplace_import_job.id),
-            None,
-        )
-        assert test_job is not None
-        assert (
-            test_job.marketplace.lower()
-            == test_marketplace_import_job.marketplace.lower()
-        )
-        assert test_job.status == test_marketplace_import_job.status
-
-    def test_get_marketplace_import_jobs_with_marketplace_filter(
-        self, db, test_marketplace_import_job
-    ):
-        """Test filtering marketplace import jobs by marketplace"""
-        result = self.service.get_marketplace_import_jobs(
-            db, marketplace=test_marketplace_import_job.marketplace, skip=0, limit=10
-        )
-
-        assert len(result) >= 1
-        for job in result:
-            assert (
-                test_marketplace_import_job.marketplace.lower()
-                in job.marketplace.lower()
-            )
-
-    def test_get_marketplace_import_jobs_with_status_filter(
-        self, db, test_marketplace_import_job
-    ):
-        """Test filtering marketplace import jobs by status"""
-        result = self.service.get_marketplace_import_jobs(
-            db, status=test_marketplace_import_job.status, skip=0, limit=10
-        )
-
-        assert len(result) >= 1
-        for job in result:
-            assert job.status == test_marketplace_import_job.status
-
-    def test_get_marketplace_import_jobs_pagination(
-        self, db, test_marketplace_import_job
-    ):
-        """Test marketplace import jobs pagination"""
-        result_page1 = self.service.get_marketplace_import_jobs(db, skip=0, limit=1)
-        result_page2 = self.service.get_marketplace_import_jobs(db, skip=1, limit=1)
-
-        assert len(result_page1) >= 0
-        assert len(result_page2) >= 0
-
-        if len(result_page1) > 0 and len(result_page2) > 0:
-            assert result_page1[0].job_id != result_page2[0].job_id
+    # NOTE: Marketplace Import Jobs tests have been moved to the marketplace module.
+    # See tests/unit/services/test_marketplace_import_job_service.py
 
     # Statistics Tests
     def test_get_user_statistics(self, db, test_user, test_admin):