feat: add data import/export bundle

backend/internal/service/admin_service.go

@@ -166,6 +166,8 @@ type CreateAccountInput struct {
 	GroupIDs           []int64
 	ExpiresAt          *int64
 	AutoPauseOnExpired *bool
+	// SkipDefaultGroupBind prevents auto-binding to platform default group when GroupIDs is empty.
+	SkipDefaultGroupBind bool
 	// SkipMixedChannelCheck skips the mixed channel risk check when binding groups.
 	// This should only be set when the caller has explicitly confirmed the risk.
 	SkipMixedChannelCheck bool
@@ -1004,7 +1006,7 @@ func (s *adminServiceImpl) CreateAccount(ctx context.Context, input *CreateAccou
 	// 绑定分组
 	groupIDs := input.GroupIDs
 	// 如果没有指定分组,自动绑定对应平台的默认分组
-	if len(groupIDs) == 0 {
+	if len(groupIDs) == 0 && !input.SkipDefaultGroupBind {
 		defaultGroupName := input.Platform + "-default"
 		groups, err := s.groupRepo.ListActiveByPlatform(ctx, input.Platform)
 		if err == nil {