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/bigIntSupport/index.d.ts

@@ -0,0 +1,11 @@
+import { PluginFunc } from 'dayjs/esm'
+
+declare module 'dayjs/esm' {
+  interface ConfigTypeMap {
+    bigIntSupport: BigInt
+  }
+  export function unix(t: BigInt): Dayjs
+}
+
+declare const plugin: PluginFunc
+export = plugin

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

@@ -0,0 +1,32 @@
+// eslint-disable-next-line valid-typeof
+var isBigInt = function isBigInt(num) {
+  return typeof num === 'bigint';
+};
+
+export default (function (o, c, dayjs) {
+  var proto = c.prototype;
+
+  var parseDate = function parseDate(cfg) {
+    var date = cfg.date;
+
+    if (isBigInt(date)) {
+      return Number(date);
+    }
+
+    return date;
+  };
+
+  var oldParse = proto.parse;
+
+  proto.parse = function (cfg) {
+    cfg.date = parseDate.bind(this)(cfg);
+    oldParse.bind(this)(cfg);
+  };
+
+  var oldUnix = dayjs.unix;
+
+  dayjs.unix = function (timestamp) {
+    var ts = isBigInt(timestamp) ? Number(timestamp) : timestamp;
+    return oldUnix(ts);
+  };
+});