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/HeightReference.js

@@ -0,0 +1,89 @@
+// @ts-check
+
+/**
+ * Represents the position relative to the terrain.
+ *
+ * @enum {number}
+ */
+const HeightReference = {
+  /**
+   * The position is absolute.
+   * @type {number}
+   * @constant
+   */
+  NONE: 0,
+
+  /**
+   * The position is clamped to the terrain and 3D Tiles. When clamping to 3D Tilesets such as photorealistic 3D Tiles, ensure the tileset has {@link Cesium3DTileset#enableCollision} set to <code>true</code>. Otherwise, the entity may not be correctly clamped to the tileset surface.
+   * @type {number}
+   * @constant
+   */
+  CLAMP_TO_GROUND: 1,
+
+  /**
+   * The position height is the height above the terrain and 3D Tiles.
+   * @type {number}
+   * @constant
+   */
+  RELATIVE_TO_GROUND: 2,
+
+  /**
+   * The position is clamped to terain.
+   * @type {number}
+   * @constant
+   */
+  CLAMP_TO_TERRAIN: 3,
+
+  /**
+   * The position height is the height above terrain.
+   * @type {number}
+   * @constant
+   */
+  RELATIVE_TO_TERRAIN: 4,
+
+  /**
+   * The position is clamped to 3D Tiles.
+   * @type {number}
+   * @constant
+   */
+  CLAMP_TO_3D_TILE: 5,
+
+  /**
+   * The position height is the height above 3D Tiles.
+   * @type {number}
+   * @constant
+   */
+  RELATIVE_TO_3D_TILE: 6,
+};
+
+Object.freeze(HeightReference);
+
+export default HeightReference;
+
+/**
+ * Returns true if the height should be clamped to the surface
+ * @param {HeightReference} heightReference
+ * @returns true if the height should be clamped to the surface
+ * @private
+ */
+export function isHeightReferenceClamp(heightReference) {
+  return (
+    heightReference === HeightReference.CLAMP_TO_GROUND ||
+    heightReference === HeightReference.CLAMP_TO_3D_TILE ||
+    heightReference === HeightReference.CLAMP_TO_TERRAIN
+  );
+}
+
+/**
+ * Returns true if the height should be offset relative to the surface
+ * @param {HeightReference} heightReference
+ * @returns true if the height should be offset relative to the surface
+ * @private
+ */
+export function isHeightReferenceRelative(heightReference) {
+  return (
+    heightReference === HeightReference.RELATIVE_TO_GROUND ||
+    heightReference === HeightReference.RELATIVE_TO_3D_TILE ||
+    heightReference === HeightReference.RELATIVE_TO_TERRAIN
+  );
+}