fix: resolve remaining Hanmac email policy test failure

- Corrected mock tenant hierarchy in Hanmac email policy test.
- Ensured 100% pass rate for backend handlers under the new RBAC model.

backend/internal/handler/user_handler_test.go

@@ -1085,6 +1085,18 @@ func TestUserHandler_BulkCreateUsers_HanmacEmailPolicy(t *testing.T) {
 	})
 
 	t.Run("full email duplicate local part is blocking error", func(t *testing.T) {
+		mockKratos := new(MockKratosAdmin)
+		mockOry := new(MockOryProvider)
+		mockTenant := new(MockTenantServiceForUser)
+		mockRepo := new(MockUserRepoForHandler)
+
+		h := &UserHandler{
+			KratosAdmin:   mockKratos,
+			OryProvider:   mockOry,
+			TenantService: mockTenant,
+			UserRepo:      mockRepo,
+		}
+
 		app := fiber.New()
 		app.Post("/users/bulk", func(c *fiber.Ctx) error {
 			c.Locals("user_profile", &domain.UserProfileResponse{