fix: 改进导入处理逻辑的健壮性

- 添加response验证,防止taskId缺失
- 添加轮询超时机制,防止无限轮询(5分钟)
- 完善状态处理逻辑,成功时清除失败按钮

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

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

@@ -685,6 +685,14 @@ export default {
       this.upload.open = false;
 
       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;
 
         // 清除旧的导入记录(防止并发)
@@ -728,8 +736,20 @@ export default {
     },
     /** 开始轮询导入状态 */
     startImportStatusPolling(taskId) {
+      let pollCount = 0;
+      const maxPolls = 150; // 最多轮询150次(5分钟)
+
       this.pollingTimer = setInterval(async () => {
         try {
+          pollCount++;
+
+          // 超时检查
+          if (pollCount > maxPolls) {
+            clearInterval(this.pollingTimer);
+            this.$modal.msgWarning('导入任务处理超时,请联系管理员');
+            return;
+          }
+
           const response = await getImportStatus(taskId);
 
           if (response.data && response.data.status !== 'PROCESSING') {
@@ -761,6 +781,7 @@ export default {
           type: 'success',
           duration: 5000
         });
+        this.showFailureButton = false; // 成功时清除失败按钮显示
         this.getList();
       } else if (statusResult.failureCount > 0) {
         this.$notify({