Feat: Save the configuration information of the knowledge base document #3221 (#7317)

### What problem does this PR solve?

Feat: Save the configuration information of the knowledge base document
#3221

### Type of change


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

web/src/components/delimiter-form-field.tsx

@@ -48,7 +48,7 @@ export function DelimiterFormField() {
           <FormLabel tooltip={t('knowledgeDetails.delimiterTip')}>
             {t('knowledgeDetails.delimiter')}
           </FormLabel>
-          <FormControl defaultValue={`\n`}>
+          <FormControl>
             <DelimiterInput {...field}></DelimiterInput>
           </FormControl>
           <FormMessage />