fix: resolve test compilation errors and restore upstream VERSION

- Add missing interface methods to test stubs (RemoveGroupFromUserAllowedGroups,
  GetNotifyCodeUserRate, IncrNotifyCodeUserRate, UpdateGroupIDByUserAndGroup)
- Fix NewUserService call signatures (add 4th param)
- Fix GetAccountCount return signature (3 values)
- Update api_contract_test.go snapshots for balance_notify fields
- Restore resolveOpenAIMessagesDispatchMappedModel function
- Reset VERSION to upstream 0.1.112

backend/internal/service/auth_service_register_test.go

@@ -119,6 +119,14 @@ func (s *emailCacheStub) SetPasswordResetEmailCooldown(ctx context.Context, emai
 	return nil
 }
 
+func (s *emailCacheStub) GetNotifyCodeUserRate(ctx context.Context, userID int64) (int64, error) {
+	return 0, nil
+}
+
+func (s *emailCacheStub) IncrNotifyCodeUserRate(ctx context.Context, userID int64, window time.Duration) (int64, error) {
+	return 0, nil
+}
+
 func newAuthService(repo *userRepoStub, settings map[string]string, emailCache EmailCache) *AuthService {
 	cfg := &config.Config{
 		JWT: config.JWTConfig{