fix: 使用 Contains 匹配 missing_project_id 并修复测试 mock

backend/internal/service/account_service_delete_test.go

@@ -99,6 +99,10 @@ func (s *accountRepoStub) SetError(ctx context.Context, id int64, errorMsg strin
 	panic("unexpected SetError call")
 }
 
+func (s *accountRepoStub) ClearError(ctx context.Context, id int64) error {
+	panic("unexpected ClearError call")
+}
+
 func (s *accountRepoStub) SetSchedulable(ctx context.Context, id int64, schedulable bool) error {
 	panic("unexpected SetSchedulable call")
 }

backend/internal/service/gateway_multiplatform_test.go

@@ -102,6 +102,9 @@ func (m *mockAccountRepoForPlatform) BatchUpdateLastUsed(ctx context.Context, up
 func (m *mockAccountRepoForPlatform) SetError(ctx context.Context, id int64, errorMsg string) error {
 	return nil
 }
+func (m *mockAccountRepoForPlatform) ClearError(ctx context.Context, id int64) error {
+	return nil
+}
 func (m *mockAccountRepoForPlatform) SetSchedulable(ctx context.Context, id int64, schedulable bool) error {
 	return nil
 }

backend/internal/service/gemini_multiplatform_test.go

@@ -87,6 +87,9 @@ func (m *mockAccountRepoForGemini) BatchUpdateLastUsed(ctx context.Context, upda
 func (m *mockAccountRepoForGemini) SetError(ctx context.Context, id int64, errorMsg string) error {
 	return nil
 }
+func (m *mockAccountRepoForGemini) ClearError(ctx context.Context, id int64) error {
+	return nil
+}
 func (m *mockAccountRepoForGemini) SetSchedulable(ctx context.Context, id int64, schedulable bool) error {
 	return nil
 }