fix(tests): remove stale onboarding redirect tests and mock billing limits

Remove marketplace page redirect-to-onboarding tests that no longer
match the route behavior. Add can_create_store mock to tenancy store
creation tests to bypass billing limit checks.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/tenancy/tests/unit/test_merchant_store_service.py

@@ -193,7 +193,8 @@ class TestMerchantStoreServiceCreate:
         assert result["is_active"] is True
         assert result["is_verified"] is False
 
-    def test_create_store_duplicate_code(self, db, merchant_owner, merchant_store):
+    @patch.object(MerchantStoreService, "can_create_store", return_value=(True, None))
+    def test_create_store_duplicate_code(self, _mock_limit, db, merchant_owner, merchant_store):
         """Test creating store with duplicate store code."""
         store_data = {
             "name": "Another Store",
@@ -206,7 +207,8 @@ class TestMerchantStoreServiceCreate:
         with pytest.raises(StoreAlreadyExistsException):
             self.service.create_store(db, merchant_owner.id, store_data)
 
-    def test_create_store_duplicate_subdomain(self, db, merchant_owner, merchant_store):
+    @patch.object(MerchantStoreService, "can_create_store", return_value=(True, None))
+    def test_create_store_duplicate_subdomain(self, _mock_limit, db, merchant_owner, merchant_store):
         """Test creating store with duplicate subdomain."""
         store_data = {
             "name": "Another Store",
@@ -219,7 +221,8 @@ class TestMerchantStoreServiceCreate:
         with pytest.raises(StoreValidationException):
             self.service.create_store(db, merchant_owner.id, store_data)
 
-    def test_create_store_nonexistent_merchant(self, db):
+    @patch.object(MerchantStoreService, "can_create_store", return_value=(True, None))
+    def test_create_store_nonexistent_merchant(self, _mock_limit, db):
         """Test creating store for non-existent merchant."""
         store_data = {
             "name": "No Merchant Store",
@@ -232,7 +235,8 @@ class TestMerchantStoreServiceCreate:
         with pytest.raises(MerchantNotFoundException):
             self.service.create_store(db, 99999, store_data)
 
-    def test_create_store_creates_default_roles(self, db, merchant_owner):
+    @patch.object(MerchantStoreService, "can_create_store", return_value=(True, None))
+    def test_create_store_creates_default_roles(self, _mock_limit, db, merchant_owner):
         """Test that default roles are created for new store."""
         from app.modules.tenancy.models.store import Role