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/I3SFeature.js

@@ -0,0 +1,61 @@
+import defined from "../Core/defined.js";
+import I3SDataProvider from "./I3SDataProvider.js";
+
+/**
+ * This class implements an I3S Feature.
+ * <p>
+ * Do not construct this directly, instead access tiles through {@link I3SNode}.
+ * </p>
+ * @alias I3SFeature
+ * @internalConstructor
+ */
+function I3SFeature(parent, uri) {
+  this._parent = parent;
+  this._dataProvider = parent._dataProvider;
+  this._layer = parent._layer;
+
+  if (defined(this._parent._nodeIndex)) {
+    this._resource = this._parent._layer.resource.getDerivedResource({
+      url: `nodes/${this._parent._data.mesh.attribute.resource}/${uri}`,
+    });
+  } else {
+    this._resource = this._parent.resource.getDerivedResource({ url: uri });
+  }
+}
+
+Object.defineProperties(I3SFeature.prototype, {
+  /**
+   * Gets the resource for the feature
+   * @memberof I3SFeature.prototype
+   * @type {Resource}
+   * @readonly
+   */
+  resource: {
+    get: function () {
+      return this._resource;
+    },
+  },
+  /**
+   * Gets the I3S data for this object.
+   * @memberof I3SFeature.prototype
+   * @type {object}
+   * @readonly
+   */
+  data: {
+    get: function () {
+      return this._data;
+    },
+  },
+});
+
+/**
+ * Loads the content.
+ * @returns {Promise<object>} A promise that is resolved when the data of the I3S feature is loaded
+ * @private
+ */
+I3SFeature.prototype.load = async function () {
+  this._data = await I3SDataProvider.loadJson(this._resource);
+  return this._data;
+};
+
+export default I3SFeature;