Feat: Set the default value of Chunk token number to 512 #6016 (#6017)

### What problem does this PR solve?

Feat: Set the default value of Chunk token number to 512 #6016

### Type of change


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

web/src/components/max-token-number.tsx

@@ -6,7 +6,7 @@ interface IProps {
   max?: number;
 }
 
-const MaxTokenNumber = ({ initialValue = 128, max = 2048 }: IProps) => {
+const MaxTokenNumber = ({ initialValue = 512, max = 2048 }: IProps) => {
   const { t } = useTranslate('knowledgeConfiguration');
 
   return (