Feat: support agent version history. (#6130)

### What problem does this PR solve?
Add history version save
- Allows users to view and download agent files by version revision
history

![image](https://github.com/user-attachments/assets/c300375d-8b97-4230-9fc4-83d148137132)

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

web/src/pages/flow/canvas/index.tsx

@@ -46,7 +46,7 @@ import { RewriteNode } from './node/rewrite-node';
 import { SwitchNode } from './node/switch-node';
 import { TemplateNode } from './node/template-node';
 
-const nodeTypes: NodeTypes = {
+export const nodeTypes: NodeTypes = {
   ragNode: RagNode,
   categorizeNode: CategorizeNode,
   beginNode: BeginNode,
@@ -66,7 +66,7 @@ const nodeTypes: NodeTypes = {
   iterationStartNode: IterationStartNode,
 };
 
-const edgeTypes = {
+export const edgeTypes = {
   buttonEdge: ButtonEdge,
 };