feat(KnowledgeItemEditor): 添加文件上传替换功能的加载状态

- 添加 loading 状态用于控制文件上传和替换操作
- 在文件上传前设置 loading 状态为 true
- 在文件替换前设置 loading 状态为 true
- 在操作完成后通过 finally 块重置 loading 状态
- 将 loading 状态绑定到确认按钮的 confirmLoading 属性

frontend/src/pages/KnowledgeManagement/components/KnowledgeItemEditor.tsx

@@ -31,6 +31,7 @@ export default function KnowledgeItemEditor({
 }) {
   const [fileList, setFileList] = useState<UploadFile[]>([]);
   const [replaceFileList, setReplaceFileList] = useState<UploadFile[]>([]);
+  const [loading, setLoading] = useState(false);
   const isFileItem =
     data?.contentType === KnowledgeContentType.FILE ||
     data?.sourceType === KnowledgeSourceType.FILE_UPLOAD;
@@ -97,6 +98,7 @@ export default function KnowledgeItemEditor({
           message.warning("请先选择文件");
           return;
         }
+        setLoading(true);
         const formData = new FormData();
         fileList.forEach((file) => {
           const origin = file.originFileObj as File | undefined;
@@ -126,6 +128,7 @@ export default function KnowledgeItemEditor({
           message.warning("请先选择要替换的文件");
           return;
         }
+        setLoading(true);
         const formData = new FormData();
         formData.append("file", replaceFile);
         await replaceKnowledgeItemFileUsingPut(setId, data.id, formData);
@@ -137,6 +140,8 @@ export default function KnowledgeItemEditor({
       onSuccess();
     } catch {
       message.error("操作失败，请重试");
+    } finally {
+      setLoading(false);
     }
   };
 
@@ -153,6 +158,7 @@ export default function KnowledgeItemEditor({
       width={860}
       maskClosable={false}
       okButtonProps={{ disabled: readOnly }}
+      confirmLoading={loading}
     >
       <Form layout="vertical" disabled={readOnly}>
         {isCreateMode && (