feat: 实现供水运营专题大屏BI可视化

- 新增OperationDashboard.vue全屏大屏组件
- 添加6个核心KPI指标卡片: 进水总量/出水总量/产销差率/营收额/平均水质/报警次数
- 实现6个ECharts图表: 供水趋势/水质分布/报警统计/管网空间/设备状态/营收分析
- 创建静态HTML版本operation-dashboard.html，使用CDN加载Vue3/ECharts/Element Plus
- 更新路由配置，添加/operation路径支持
- 修复nextTick导入问题，优化build脚本

🚧 开发者: bot_dev1
📝 任务: #38 [BI] 运营仪表盘 + 供水专题大屏

frontend/node_modules/asynckit/lib/readable_serial.js

@@ -0,0 +1,25 @@
+var serial = require('../serial.js');
+
+// API
+module.exports = ReadableSerial;
+
+/**
+ * Streaming wrapper to `asynckit.serial`
+ *
+ * @param   {array|object} list - array or object (named list) to iterate over
+ * @param   {function} iterator - iterator to run
+ * @param   {function} callback - invoked when all elements processed
+ * @returns {stream.Readable#}
+ */
+function ReadableSerial(list, iterator, callback)
+{
+  if (!(this instanceof ReadableSerial))
+  {
+    return new ReadableSerial(list, iterator, callback);
+  }
+
+  // turn on object mode
+  ReadableSerial.super_.call(this, {objectMode: true});
+
+  this._start(serial, list, iterator, callback);
+}