fix(knowledge): 移除知识条目编辑器中的冗余提示消息

- 删除了文件上传成功后的重复提示信息
- 保持了文件对象的正确处理逻辑
- 优化了用户体验避免不必要的操作反馈

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;
@@ -51,7 +52,6 @@ export default function KnowledgeItemEditor({
         originFileObj: file,
       },
     ]);
-    message.success("文件已就绪，可提交创建条目");
     return false;
   };
 
@@ -97,6 +97,7 @@ 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 +127,7 @@ 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 +139,8 @@ export default function KnowledgeItemEditor({
       onSuccess();
     } catch {
       message.error("操作失败，请重试");
+    } finally {
+      setLoading(false);
     }
   };
 
@@ -153,6 +157,7 @@ export default function KnowledgeItemEditor({
       width={860}
       maskClosable={false}
       okButtonProps={{ disabled: readOnly }}
+      confirmLoading={loading}
     >
       <Form layout="vertical" disabled={readOnly}>
         {isCreateMode && (