feat: add toc option in transformer node in ingestion pipeline (#11992)

### What problem does this PR solve?

Add TOC (Table of contents) option in Ingestion Pipeline canvas >
Transformer node

### Type of change

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

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

@@ -85,6 +85,7 @@ export enum ContextGeneratorFieldName {
   Keywords = 'keywords',
   Questions = 'questions',
   Metadata = 'metadata',
+  TableOfContents = 'toc',
 }
 
 export const FileId = 'File'; // BeginId

web/src/pages/agent/form/extractor-form/index.tsx

@@ -76,19 +76,23 @@ const ExtractorForm = ({ node }: INextOperatorForm) => {
             ></SelectWithSearch>
           )}
         </RAGFlowFormItem>
-        <RAGFlowFormItem label={t('flow.systemPrompt')} name="sys_prompt">
-          <PromptEditor
-            placeholder={t('flow.messagePlaceholder')}
-            showToolbar={true}
-            baseOptions={promptOptions}
-          ></PromptEditor>
-        </RAGFlowFormItem>
-        <RAGFlowFormItem label={t('flow.userPrompt')} name="prompts">
-          <PromptEditor
-            showToolbar={true}
-            baseOptions={promptOptions}
-          ></PromptEditor>
-        </RAGFlowFormItem>
+        {form.getValues('field_name') !== 'toc' && (
+          <>
+            <RAGFlowFormItem label={t('flow.systemPrompt')} name="sys_prompt">
+              <PromptEditor
+                placeholder={t('flow.messagePlaceholder')}
+                showToolbar={true}
+                baseOptions={promptOptions}
+              ></PromptEditor>
+            </RAGFlowFormItem>
+            <RAGFlowFormItem label={t('flow.userPrompt')} name="prompts">
+              <PromptEditor
+                showToolbar={true}
+                baseOptions={promptOptions}
+              ></PromptEditor>
+            </RAGFlowFormItem>
+          </>
+        )}
         <Output list={outputList}></Output>
       </FormWrapper>
       {visible && (