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/QuadtreeTileLoadState.js

@@ -0,0 +1,44 @@
+// @ts-check
+
+/**
+ * The state of a {@link QuadtreeTile} in the tile load pipeline.
+ * @enum {number}
+ * @private
+ */
+const QuadtreeTileLoadState = {
+  /**
+   * The tile is new and loading has not yet begun.
+   * @type QuadtreeTileLoadState
+   * @constant
+   * @default 0
+   */
+  START: 0,
+
+  /**
+   * Loading is in progress.
+   * @type QuadtreeTileLoadState
+   * @constant
+   * @default 1
+   */
+  LOADING: 1,
+
+  /**
+   * Loading is complete.
+   * @type QuadtreeTileLoadState
+   * @constant
+   * @default 2
+   */
+  DONE: 2,
+
+  /**
+   * The tile has failed to load.
+   * @type QuadtreeTileLoadState
+   * @constant
+   * @default 3
+   */
+  FAILED: 3,
+};
+
+Object.freeze(QuadtreeTileLoadState);
+
+export default QuadtreeTileLoadState;