feat(purchase-transaction): 重构handleFileSuccess方法实现异步导入优化

- 增强响应数据验证,确保taskId存在
- 清理旧的轮询定时器,避免内存泄漏
- 保存导入任务初始状态到localStorage
- 使用$notify通知替代弹窗提示
- 重置失败按钮和任务ID状态
- 调用startImportStatusPolling开始轮询

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

ruoyi-ui/src/views/ccdiPurchaseTransaction/index.vue

@@ -905,25 +905,54 @@ export default {
     handleFileUploadProgress(event, file, fileList) {
       this.upload.isUploading = true;
     },
-    // 文件上传成功处理 - 使用异步导入
+    // 文件上传成功处理
     handleFileSuccess(response, file, fileList) {
-      // 检查是否返回了taskId（异步导入）
-      if (response.code === 200 && response.data && response.data.taskId) {
-        const taskId = response.data.taskId;
-        this.upload.isUploading = false;
-        this.upload.open = false;
-        this.$refs.upload.clearFiles();
+      this.upload.isUploading = false;
+      this.upload.open = false;
 
-        // 开始轮询导入状态
-        this.startImportPolling(taskId);
+      if (response.code === 200) {
+        // 验证响应数据完整性
+        if (!response.data || !response.data.taskId) {
+          this.$modal.msgError('导入任务创建失败:缺少任务ID');
+          this.upload.isUploading = false;
+          this.upload.open = true;
+          return;
+        }
+
+        const taskId = response.data.taskId;
+
+        // 清除旧的轮询定时器
+        if (this.importPollingTimer) {
+          clearInterval(this.importPollingTimer);
+          this.importPollingTimer = null;
+        }
+
+        this.clearImportTaskFromStorage();
+
+        // 保存新任务的初始状态
+        this.saveImportTaskToStorage({
+          taskId: taskId,
+          status: 'PROCESSING',
+          timestamp: Date.now(),
+          hasFailures: false
+        });
+
+        // 重置状态
+        this.showFailureButton = false;
+        this.currentTaskId = taskId;
+
+        // 显示后台处理提示(不是弹窗,是通知)
+        this.$notify({
+          title: '导入任务已提交',
+          message: '正在后台处理中,处理完成后将通知您',
+          type: 'info',
+          duration: 3000
+        });
+
+        // 开始轮询检查状态
+        this.startImportStatusPolling(taskId);
       } else {
-        // 同步导入结果（如果后端改为同步）
-        this.upload.isUploading = false;
-        this.upload.open = false;
-        this.getList();
-        this.importResultContent = response.msg || response;
-        this.importResultVisible = true;
-        this.$refs.upload.clearFiles();
+        this.$modal.msgError(response.msg);
       }
     },
     // 开始轮询导入状态