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/QuadtreeOccluders.js

@@ -0,0 +1,35 @@
+// @ts-check
+
+import Cartesian3 from "../Core/Cartesian3.js";
+import EllipsoidalOccluder from "../Core/EllipsoidalOccluder.js";
+
+/** @import Ellipsoid from "../Core/Ellipsoid.js"; */
+
+/**
+ * A set of occluders that can be used to test quadtree tiles for occlusion.
+ *
+ * @private
+ */
+class QuadtreeOccluders {
+  /**
+   * @param {object} [options]
+   * @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid that potentially occludes tiles.
+   */
+  constructor(options) {
+    this._ellipsoid = new EllipsoidalOccluder(
+      options.ellipsoid,
+      Cartesian3.ZERO,
+    );
+  }
+
+  /**
+   * Gets the {@link EllipsoidalOccluder} that can be used to determine if a point is
+   * occluded by an {@link Ellipsoid}.
+   * @type {EllipsoidalOccluder}
+   */
+  get ellipsoid() {
+    return this._ellipsoid;
+  }
+}
+
+export default QuadtreeOccluders;