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/es/components/skeleton/index.d.ts

@@ -0,0 +1,13 @@
+import { SFCWithInstall } from "../../utils/vue/typescript.js";
+import { SkeletonInstance, SkeletonProps, SkeletonPropsPublic, skeletonProps } from "./src/skeleton.js";
+import _default from "./src/skeleton.vue.js";
+import { SkeletonItemInstance, SkeletonItemProps, SkeletonItemPropsPublic, skeletonItemProps } from "./src/skeleton-item.js";
+import _default$1 from "./src/skeleton-item.vue.js";
+
+//#region ../../packages/components/skeleton/index.d.ts
+declare const ElSkeleton: SFCWithInstall<typeof _default> & {
+  SkeletonItem: typeof _default$1;
+};
+declare const ElSkeletonItem: SFCWithInstall<typeof _default$1>;
+//#endregion
+export { ElSkeleton, ElSkeleton as default, ElSkeletonItem, SkeletonInstance, SkeletonItemInstance, SkeletonItemProps, SkeletonItemPropsPublic, SkeletonProps, SkeletonPropsPublic, skeletonItemProps, skeletonProps };