feat: 添加lastImportInfo计算属性

- 显示上次导入的信息摘要
- 包含导入时间、总数、成功数、失败数

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

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

@@ -696,6 +696,18 @@ export default {
       }
     };
   },
+  computed: {
+    /**
+     * 上次导入信息摘要
+     */
+    lastImportInfo() {
+      const savedTask = this.getImportTaskFromStorage();
+      if (savedTask && savedTask.totalCount) {
+        return `导入时间: ${this.parseTime(savedTask.saveTime)} | 总数: ${savedTask.totalCount}条 | 成功: ${savedTask.successCount}条 | 失败: ${savedTask.failureCount}条`;
+      }
+      return '';
+    }
+  },
   created() {
     this.getList();
   },