feat: delete the added model #503 and display an error message when the requested file fails to parse #684 (#708)

### What problem does this PR solve?

feat: delete the added model #503
feat: display an error message when the requested file fails to parse
#684

### Type of change

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

web/src/pages/chat/embed-modal/index.tsx

@@ -1,5 +1,6 @@
 import CopyToClipboard from '@/components/copy-to-clipboard';
 import HightLightMarkdown from '@/components/highlight-markdown';
+import { Domain } from '@/constants/common';
 import { useTranslate } from '@/hooks/commonHooks';
 import { IModalProps } from '@/interfaces/common';
 import { Card, Modal, Tabs, TabsProps } from 'antd';
@@ -15,7 +16,7 @@ const EmbedModal = ({
   const text = `
   ~~~ html
   <iframe
-  src="https://demo.ragflow.io/chat/share?shared_id=${token}"
+  src="https://${Domain}/chat/share?shared_id=${token}"
   style="width: 100%; height: 100%; min-height: 600px"
   frameborder="0"
 >