refactor(documents): rename document tree model

backend/internal/logic/dataset/service.go

@@ -75,7 +75,7 @@ type ItemPatch struct {
 
 type DepositResult struct {
 	DocumentIdentity string
-	ProjectIdentity string
+	ProjectIdentity  string
 }
 
 type SourceRecord struct {
@@ -363,9 +363,9 @@ func (s *Service) DepositItem(userID uint, itemIdentity, projectIdentity string)
 	if !strings.HasSuffix(strings.ToLower(name), ".md") {
 		name += ".md"
 	}
-	var document models.SaDocument
+	var document models.SaDocumentTree
 	err = s.db.Transaction(func(tx *gorm.DB) error {
-		document = models.SaDocument{
+		document = models.SaDocumentTree{
 			ProjectID: project.ID, CreatedBy: userID, Kind: models.DocumentKindFile,
 			Name: name, NormalizedName: strings.ToLower(name), Extension: ".md",
 			MimeType: "text/markdown; charset=utf-8", Size: int64(len([]byte(body))),