feat(knowledgeBase): add knowledge graph rebuild and delete functionality

- Add deleteKnowledgeGraph and rebuildKnowledgeGraph API endpoints to knowledgeBase.ts
- Add internationalization strings for rebuild confirmation dialog and success/failure messages in both English and Chinese
- Implement rebuild mode logic in CreateModal component with confirmation dialog before rebuilding
- Add originalType state tracking to distinguish between rebuild and regular edit modes
- Update handleSave to trigger graph deletion and rebuild when in rebuild mode with graphrag enabled
- Add handleDeleteGraph method to delete existing knowledge graph data before rebuild
- Update performSave to use correct type value during save operation in rebuild mode
- Enhance Private.tsx to refresh knowledge base details after table data refresh
- Import new API functions (deleteKnowledgeGraph, rebuildKnowledgeGraph) in CreateModal
- Update KnowledgeGraphCard component timestamp in file header

web/src/i18n/en.ts

@@ -726,6 +726,11 @@ export const en = {
       graphTips: 'Explore the entity nodes in the knowledge base and their relationship networks',
       sourceDocuments: 'Source Documents',
       rebuildGraph: 'Rebuild Graph',
+      rebuildConfirmTitle: 'Confirm the rebuild graph',
+      rebuildConfirmContent: 'The rebuild graph will erase the existing map data and rebuild it from scratch. This operation is irreversible. Are you sure you want to proceed?',
+      deleteGraphSuccess: 'Knowledge graph deletion successful',
+      deleteGraphFailed:'Knowledge graph deletion failed',
+      graphEmpty: 'At the foot of the mountain of books, the journey begins.',
       createForm:{
         name: 'Name',
         embedding_id: 'Embedding',