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/engine/Source/Scene/StencilConstants.js

@@ -0,0 +1,37 @@
+import StencilFunction from "./StencilFunction.js";
+import StencilOperation from "./StencilOperation.js";
+
+/**
+ * The most significant bit is used to identify whether the pixel is 3D Tiles.
+ * The next three bits store selection depth for the skip LODs optimization.
+ * The last four bits are for increment/decrement shadow volume operations for classification.
+ *
+ * @private
+ */
+const StencilConstants = {
+  CESIUM_3D_TILE_MASK: 0x80,
+  SKIP_LOD_MASK: 0x70,
+  SKIP_LOD_BIT_SHIFT: 4,
+  CLASSIFICATION_MASK: 0x0f,
+};
+
+StencilConstants.setCesium3DTileBit = function () {
+  return {
+    enabled: true,
+    frontFunction: StencilFunction.ALWAYS,
+    frontOperation: {
+      fail: StencilOperation.KEEP,
+      zFail: StencilOperation.KEEP,
+      zPass: StencilOperation.REPLACE,
+    },
+    backFunction: StencilFunction.ALWAYS,
+    backOperation: {
+      fail: StencilOperation.KEEP,
+      zFail: StencilOperation.KEEP,
+      zPass: StencilOperation.REPLACE,
+    },
+    reference: StencilConstants.CESIUM_3D_TILE_MASK,
+    mask: StencilConstants.CESIUM_3D_TILE_MASK,
+  };
+};
+export default Object.freeze(StencilConstants);