Feat: Fixed the issue where the newly created agent begin node displayed "undefined". #10427 (#12348)

### What problem does this PR solve?
Feat: Fixed the issue where the newly created agent begin node displayed
"undefined". #10427

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/constant/index.tsx

@@ -15,19 +15,15 @@ import {
   initialLlmBaseValues,
 } from '@/constants/agent';
 export {
+  AgentDialogueMode,
   AgentStructuredOutputField,
   JsonSchemaDataType,
   Operator,
+  initialBeginValues,
 } from '@/constants/agent';
 
 export * from './pipeline';
 
-export enum AgentDialogueMode {
-  Conversational = 'conversational',
-  Task = 'task',
-  Webhook = 'Webhook',
-}
-
 import { ModelVariableType } from '@/constants/knowledge';
 import { t } from 'i18next';
 
@@ -109,11 +105,6 @@ export const initialRetrievalValues = {
   },
 };
 
-export const initialBeginValues = {
-  mode: AgentDialogueMode.Conversational,
-  prologue: `Hi! I'm your assistant. What can I do for you?`,
-};
-
 export const initialRewriteQuestionValues = {
   ...initialLlmBaseValues,
   language: '',
@@ -750,6 +741,8 @@ export const NodeMap = {
   [Operator.Loop]: 'loopNode',
   [Operator.LoopStart]: 'loopStartNode',
   [Operator.ExitLoop]: 'exitLoopNode',
+  [Operator.ExcelProcessor]: 'ragNode',
+  [Operator.PDFGenerator]: 'ragNode',
 };
 
 export enum BeginQueryType {