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/axios/lib/helpers/progressEventReducer.js

@@ -0,0 +1,54 @@
+import speedometer from './speedometer.js';
+import throttle from './throttle.js';
+import utils from '../utils.js';
+
+export const progressEventReducer = (listener, isDownloadStream, freq = 3) => {
+  let bytesNotified = 0;
+  const _speedometer = speedometer(50, 250);
+
+  return throttle((e) => {
+    if (!e || typeof e.loaded !== 'number') {
+      return;
+    }
+    const rawLoaded = e.loaded;
+    const total = e.lengthComputable ? e.total : undefined;
+    const loaded = total != null ? Math.min(rawLoaded, total) : rawLoaded;
+    const progressBytes = Math.max(0, loaded - bytesNotified);
+    const rate = _speedometer(progressBytes);
+
+    bytesNotified = Math.max(bytesNotified, loaded);
+
+    const data = {
+      loaded,
+      total,
+      progress: total ? loaded / total : undefined,
+      bytes: progressBytes,
+      rate: rate ? rate : undefined,
+      estimated: rate && total ? (total - loaded) / rate : undefined,
+      event: e,
+      lengthComputable: total != null,
+      [isDownloadStream ? 'download' : 'upload']: true,
+    };
+
+    listener(data);
+  }, freq);
+};
+
+export const progressEventDecorator = (total, throttled) => {
+  const lengthComputable = total != null;
+
+  return [
+    (loaded) =>
+      throttled[0]({
+        lengthComputable,
+        total,
+        loaded,
+      }),
+    throttled[1],
+  ];
+};
+
+export const asyncDecorator =
+  (fn) =>
+  (...args) =>
+    utils.asap(() => fn(...args));