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/dayjs/esm/plugin/minMax/index.d.ts

@@ -0,0 +1,22 @@
+import { PluginFunc } from 'dayjs/esm'
+
+declare const plugin: PluginFunc
+export = plugin
+
+declare module 'dayjs/esm' {
+  export function max(dayjs: [Dayjs, ...Dayjs[]]): Dayjs
+  export function max(noDates: never[]): null
+  export function max(maybeDates: Dayjs[]): Dayjs | null
+
+  export function max(...dayjs: [Dayjs, ...Dayjs[]]): Dayjs
+  export function max(...noDates: never[]): null
+  export function max(...maybeDates: Dayjs[]): Dayjs | null
+
+  export function min(dayjs: [Dayjs, ...Dayjs[]]): Dayjs
+  export function min(noDates: never[]): null
+  export function min(maybeDates: Dayjs[]): Dayjs | null
+
+  export function min(...dayjs: [Dayjs, ...Dayjs[]]): Dayjs
+  export function min(...noDates: never[]): null
+  export function min(...maybeDates: Dayjs[]): Dayjs | null
+}

frontend/node_modules/dayjs/esm/plugin/minMax/index.js

@@ -0,0 +1,39 @@
+export default (function (o, c, d) {
+  var sortBy = function sortBy(method, dates) {
+    if (!dates || !dates.length || dates.length === 1 && !dates[0] || dates.length === 1 && Array.isArray(dates[0]) && !dates[0].length) {
+      return null;
+    }
+
+    if (dates.length === 1 && dates[0].length > 0) {
+      var _dates = dates;
+      dates = _dates[0];
+    }
+
+    dates = dates.filter(function (date) {
+      return date;
+    });
+    var result;
+    var _dates2 = dates;
+    result = _dates2[0];
+
+    for (var i = 1; i < dates.length; i += 1) {
+      if (!dates[i].isValid() || dates[i][method](result)) {
+        result = dates[i];
+      }
+    }
+
+    return result;
+  };
+
+  d.max = function () {
+    var args = [].slice.call(arguments, 0); // eslint-disable-line prefer-rest-params
+
+    return sortBy('isAfter', args);
+  };
+
+  d.min = function () {
+    var args = [].slice.call(arguments, 0); // eslint-disable-line prefer-rest-params
+
+    return sortBy('isBefore', args);
+  };
+});