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/cesium/Source/Widgets/NavigationHelpButton/lighter.css

@@ -0,0 +1,46 @@
+.cesium-lighter .cesium-navigation-help-instructions {
+  border: 1px solid #759dc0;
+  background-color: rgba(255, 255, 255, 0.9);
+}
+
+.cesium-lighter .cesium-navigation-help-pan {
+  color: #66ccee;
+  font-weight: bold;
+}
+
+.cesium-lighter .cesium-navigation-help-zoom {
+  color: #65ec00;
+  font-weight: bold;
+}
+
+.cesium-lighter .cesium-navigation-help-rotate {
+  color: #eec722;
+  font-weight: bold;
+}
+
+.cesium-lighter .cesium-navigation-help-tilt {
+  color: #d800d8;
+  font-weight: bold;
+}
+
+.cesium-lighter .cesium-navigation-help-details {
+  color: #222222;
+}
+
+.cesium-lighter .cesium-navigation-button {
+  color: #222222;
+  border-top: 1px solid #759dc0;
+  border-right: 1px solid #759dc0;
+}
+
+.cesium-lighter .cesium-navigation-button-selected {
+  background-color: rgba(196, 225, 255, 0.9);
+}
+
+.cesium-lighter .cesium-navigation-button-unselected {
+  background-color: rgba(226, 240, 255, 0.9);
+}
+
+.cesium-lighter .cesium-navigation-button-unselected:hover {
+  background-color: rgba(166, 210, 255, 0.9);
+}