feat: add knowledge markdown formatting and detail retrieval

- Implemented KnowledgeWebsiteMarkdownPrompt for formatting webpage content into Markdown.
- Added GetItemDetail method in KnowledgeHandler to retrieve knowledge item details.
- Introduced KnowledgeDetailDrawer component for displaying knowledge item details in the admin web interface.
- Created MarkdownPreview component for rendering Markdown content.
- Added knowledge chunking and URL parsing logic to handle webpage content extraction and formatting.
- Updated database schema to include markdown_content in knowledge_items table.

apps/admin-web/src/main.ts

@@ -26,6 +26,7 @@ import {
   Popconfirm,
   Progress,
   Radio,
+  Result,
   Row,
   Select,
   Skeleton,
@@ -92,6 +93,7 @@ app.component("ATextarea", Input.TextArea);
   Popconfirm,
   Progress,
   Radio,
+  Result,
   Row,
   Select,
   Skeleton,