feat(KnowledgeBase): 优化知识库文件上传功能

- 添加提交状态控制，防止重复提交
- 将分块选项中的"按章节分块"改为"按句子分块"
- 更新固定长度分块的选项值从FIXED_LENGTH_CHUNK到LENGTH_CHUNK
- 简化文件计数逻辑，直接统计选中文件数量
- 添加上传进度提示消息
- 重构文件数据结构，确保ID为字符串类型
- 添加按钮禁用状态控制，提升用户体验
- 优化消息提示的显示方式，支持更新现有消息

frontend/src/pages/KnowledgeBase/components/AddDataDialog.tsx

@@ -21,15 +21,16 @@ export default function AddDataDialog({ knowledgeBase, onDataAdded }) {
   const { message } = App.useApp();
   const [form] = Form.useForm();
   const [currentStep, setCurrentStep] = useState(0);
+  const [isSubmitting, setIsSubmitting] = useState(false);
 
   const [selectedFilesMap, setSelectedFilesMap] = useState({});
 
   // 定义分块选项
   const sliceOptions = [
     { label: "默认分块", value: "DEFAULT_CHUNK" },
-    { label: "按章节分块", value: "CHAPTER_CHUNK" },
+    { label: "按句子分块", value: "SENTENCE_CHUNK" },
     { label: "按段落分块", value: "PARAGRAPH_CHUNK" },
-    { label: "固定长度分块", value: "FIXED_LENGTH_CHUNK" },
+    { label: "固定长度分块", value: "LENGTH_CHUNK" },
     { label: "自定义分隔符分块", value: "CUSTOM_SEPARATOR_CHUNK" },
   ];
 
@@ -57,12 +58,7 @@ export default function AddDataDialog({ knowledgeBase, onDataAdded }) {
   ];
 
   // 获取已选择文件总数
-  const getSelectedFilesCount = () => {
-    return Object.values(selectedFilesMap).reduce(
-      (total, ids) => total + ids.length,
-      0
-    );
-  };
+  const getSelectedFilesCount = () => Object.keys(selectedFilesMap).length;
 
   const handleNext = () => {
     // 验证当前步骤
@@ -112,15 +108,29 @@ export default function AddDataDialog({ knowledgeBase, onDataAdded }) {
   };
 
   const handleAddData = async () => {
+    if (isSubmitting) {
+      return;
+    }
     if (getSelectedFilesCount() === 0) {
       message.warning("请至少选择一个文件");
       return;
     }
 
     try {
+      setIsSubmitting(true);
+      const uploadMessageKey = "kb-add-files";
+      message.open({
+        type: "loading",
+        content: "正在上传，请稍候...",
+        key: uploadMessageKey,
+        duration: 0,
+      });
       // 构造符合API要求的请求数据
       const requestData = {
-        files: Object.values(selectedFilesMap),
+        files: Object.values(selectedFilesMap).map((file) => ({
+          id: String(file.id),
+          fileName: file.fileName,
+        })),
         processType: newKB.processType,
         chunkSize: Number(newKB.chunkSize), // 确保是数字类型
         overlapSize: Number(newKB.overlapSize), // 确保是数字类型
@@ -132,12 +142,20 @@ export default function AddDataDialog({ knowledgeBase, onDataAdded }) {
       // 先通知父组件刷新数据（确保刷新发生在重置前）
       onDataAdded?.();
 
-      message.success("数据添加成功");
+      message.success({
+        content: "数据添加成功",
+        key: uploadMessageKey,
+      });
       // 重置状态
       setOpen(false);
     } catch (error) {
-      message.error("数据添加失败，请重试");
+      message.error({
+        content: "数据添加失败，请重试",
+        key: "kb-add-files",
+      });
       console.error("添加文件失败:", error);
+    } finally {
+      setIsSubmitting(false);
     }
   };
 
@@ -221,10 +239,12 @@ export default function AddDataDialog({ knowledgeBase, onDataAdded }) {
         footer={
           <div className="space-x-2">
             {currentStep === 0 && (
-              <Button onClick={handleModalCancel}>取消</Button>
+              <Button onClick={handleModalCancel} disabled={isSubmitting}>
+                取消
+              </Button>
             )}
             {currentStep > 0 && (
-              <Button disabled={false} onClick={handlePrev}>
+              <Button disabled={isSubmitting} onClick={handlePrev}>
                 上一步
               </Button>
             )}
@@ -235,14 +255,20 @@ export default function AddDataDialog({ knowledgeBase, onDataAdded }) {
                   Object.keys(selectedFilesMap).length === 0 ||
                   !newKB.chunkSize ||
                   !newKB.overlapSize ||
-                  !newKB.processType
+                  !newKB.processType ||
+                  isSubmitting
                 }
                 onClick={handleNext}
               >
                 下一步
               </Button>
             ) : (
-              <Button type="primary" onClick={handleAddData}>
+              <Button
+                type="primary"
+                onClick={handleAddData}
+                loading={isSubmitting}
+                disabled={isSubmitting}
+              >
                 确认上传
               </Button>
             )}