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/element-plus/lib/utils/rand.js

@@ -0,0 +1,19 @@
+Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
+//#region ../../packages/utils/rand.ts
+/**
+* @deprecated Use `useId` `useIdInjection` instead
+* Generate random number in range [0, 1000]
+* Maybe replace with [uuid](https://www.npmjs.com/package/uuid)
+*/
+const generateId = () => Math.floor(Math.random() * 1e4);
+/**
+* @deprecated
+* Generating a random int in range (0, max - 1)
+* @param max {number}
+*/
+const getRandomInt = (max) => Math.floor(Math.random() * Math.floor(max));
+//#endregion
+exports.generateId = generateId;
+exports.getRandomInt = getRandomInt;
+
+//# sourceMappingURL=rand.js.map