feat: update DocumentVersionInfo and Document interfaces for DocumentVersion API

- Add version_number field to DocumentVersionInfo interface
- Remove root_document field from Document interface (field removed from backend model)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src-ui/src/app/data/document.ts

@@ -162,7 +162,6 @@ export interface Document extends ObjectWithPermissions {
   duplicate_documents?: Document[]
 
   // Versioning
-  root_document?: number
   versions?: DocumentVersionInfo[]
 
   // Frontend only
@@ -171,6 +170,7 @@ export interface Document extends ObjectWithPermissions {
 
 export interface DocumentVersionInfo {
   id: number
+  version_number: number
   added?: Date
   version_label?: string
   checksum?: string