feat(sync): full code sync from release

backend/internal/service/account_service.go

@@ -119,6 +119,10 @@ type AccountService struct {
 	groupRepo   GroupRepository
 }
 
+type groupExistenceBatchChecker interface {
+	ExistsByIDs(ctx context.Context, ids []int64) (map[int64]bool, error)
+}
+
 // NewAccountService 创建账号服务实例
 func NewAccountService(accountRepo AccountRepository, groupRepo GroupRepository) *AccountService {
 	return &AccountService{
@@ -131,11 +135,8 @@ func NewAccountService(accountRepo AccountRepository, groupRepo GroupRepository)
 func (s *AccountService) Create(ctx context.Context, req CreateAccountRequest) (*Account, error) {
 	// 验证分组是否存在（如果指定了分组）
 	if len(req.GroupIDs) > 0 {
-		for _, groupID := range req.GroupIDs {
-			_, err := s.groupRepo.GetByID(ctx, groupID)
-			if err != nil {
-				return nil, fmt.Errorf("get group: %w", err)
-			}
+		if err := s.validateGroupIDsExist(ctx, req.GroupIDs); err != nil {
+			return nil, err
 		}
 	}
 
@@ -256,11 +257,8 @@ func (s *AccountService) Update(ctx context.Context, id int64, req UpdateAccount
 
 	// 先验证分组是否存在（在任何写操作之前）
 	if req.GroupIDs != nil {
-		for _, groupID := range *req.GroupIDs {
-			_, err := s.groupRepo.GetByID(ctx, groupID)
-			if err != nil {
-				return nil, fmt.Errorf("get group: %w", err)
-			}
+		if err := s.validateGroupIDsExist(ctx, *req.GroupIDs); err != nil {
+			return nil, err
 		}
 	}
 
@@ -300,6 +298,39 @@ func (s *AccountService) Delete(ctx context.Context, id int64) error {
 	return nil
 }
 
+func (s *AccountService) validateGroupIDsExist(ctx context.Context, groupIDs []int64) error {
+	if len(groupIDs) == 0 {
+		return nil
+	}
+	if s.groupRepo == nil {
+		return fmt.Errorf("group repository not configured")
+	}
+
+	if batchChecker, ok := s.groupRepo.(groupExistenceBatchChecker); ok {
+		existsByID, err := batchChecker.ExistsByIDs(ctx, groupIDs)
+		if err != nil {
+			return fmt.Errorf("check groups exists: %w", err)
+		}
+		for _, groupID := range groupIDs {
+			if groupID <= 0 {
+				return fmt.Errorf("get group: %w", ErrGroupNotFound)
+			}
+			if !existsByID[groupID] {
+				return fmt.Errorf("get group: %w", ErrGroupNotFound)
+			}
+		}
+		return nil
+	}
+
+	for _, groupID := range groupIDs {
+		_, err := s.groupRepo.GetByID(ctx, groupID)
+		if err != nil {
+			return fmt.Errorf("get group: %w", err)
+		}
+	}
+	return nil
+}
+
 // UpdateStatus 更新账号状态
 func (s *AccountService) UpdateStatus(ctx context.Context, id int64, status string, errorMessage string) error {
 	account, err := s.accountRepo.GetByID(ctx, id)