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/loading/index.d.ts

@@ -0,0 +1,17 @@
+import { LoadingOptions, LoadingOptionsResolved, LoadingParentElement } from "./src/types.js";
+import { LoadingInstance } from "./src/loading.js";
+import Loading from "./src/service.js";
+import vLoading, { ElementLoading, LoadingBinding } from "./src/directive.js";
+import { App, AppContext, Directive } from "vue";
+
+//#region ../../packages/components/loading/index.d.ts
+declare const ElLoading: {
+  install(app: App): void;
+  directive: Directive<ElementLoading, LoadingBinding>;
+  service: {
+    (options?: LoadingOptions, context?: AppContext | null): LoadingInstance;
+    _context: AppContext | null;
+  };
+};
+//#endregion
+export { ElLoading, ElLoading as default, vLoading as ElLoadingDirective, vLoading, Loading as ElLoadingService, type LoadingInstance, LoadingOptions, LoadingOptionsResolved, LoadingParentElement };