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/dom/position.d.ts

@@ -0,0 +1,10 @@
+//#region ../../packages/utils/dom/position.d.ts
+declare const isInContainer: (el?: Element, container?: Element | Window) => boolean;
+declare const getOffsetTop: (el: HTMLElement) => number;
+declare const getOffsetTopDistance: (el: HTMLElement, containerEl: HTMLElement) => number;
+declare const getClientXY: (event: MouseEvent | TouchEvent) => {
+  clientX: number;
+  clientY: number;
+};
+//#endregion
+export { getClientXY, getOffsetTop, getOffsetTopDistance, isInContainer };