migrate from github

internal/dto/document_version.go

@@ -0,0 +1,11 @@
+package dto
+
+import "time"
+
+type DocumentVersionResponse struct {
+	Version       int       `json:"version"`
+	Title         string    `json:"title"`
+	Content       string    `json:"content"`
+	ChangeSummary string    `json:"change_summary"`
+	CreatedAt     time.Time `json:"created_at"`
+}