feat: Day 21-22 - knowledge base frontend completed, fix CORS and file upload issues

- Complete knowledge base list and detail pages
- Complete document upload component
- Fix CORS config (add PUT/DELETE method support)
- Fix file upload issues (disabled state and beforeUpload return value)
- Add detailed debug logs (cleaned up)
- Create Day 21-22 completion summary document

frontend/src/components/knowledge/CreateKBDialog.tsx

@@ -113,3 +113,4 @@ const CreateKBDialog: React.FC<CreateKBDialogProps> = ({
 
 export default CreateKBDialog;
 
+

frontend/src/components/knowledge/DocumentList.tsx

@@ -209,3 +209,4 @@ const DocumentList: React.FC<DocumentListProps> = ({
 
 export default DocumentList;
 
+

frontend/src/components/knowledge/DocumentUpload.tsx

@@ -56,7 +56,7 @@ const DocumentUpload: React.FC<DocumentUploadProps> = ({
       return Upload.LIST_IGNORE;
     }
 
-    return false; // 阻止自动上传，我们手动处理
+    // 不返回任何值，让 customRequest 处理上传
   };
 
   const customRequest: UploadProps['customRequest'] = async (options) => {

frontend/src/components/knowledge/EditKBDialog.tsx

@@ -109,3 +109,4 @@ const EditKBDialog: React.FC<EditKBDialogProps> = ({
 
 export default EditKBDialog;
 
+

frontend/src/components/knowledge/KnowledgeBaseList.tsx

@@ -201,3 +201,4 @@ const KnowledgeBaseList: React.FC<KnowledgeBaseListProps> = ({
 
 export default KnowledgeBaseList;
 
+