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/getMetadataProperty.js

@@ -0,0 +1,48 @@
+import defined from "../Core/defined.js";
+
+/**
+ * Return the `PropertyTextureProperty` from the given `StructuralMetadata`
+ * that matches the given description.
+ *
+ * If the given structural metadata is `undefined`, then `undefined` is returned.
+ *
+ * Otherwise, this method will check all the property textures in the given
+ * structural metadata.
+ *
+ * If it finds a property texture that has a class with an `_id` that matches
+ * the given name, and that contains a property for the given property name, then
+ * this property is returned.
+ *
+ * Otherwise, `undefined` is returned
+ *
+ * @param {StructuralMetadata} structuralMetadata The structural metadata
+ * @param {string} className The name of the metadata class
+ * @param {string} propertyName The name of the metadata property
+ * @returns {PropertyTextureProperty|undefined}
+ * @private
+ */
+function getMetadataProperty(structuralMetadata, className, propertyName) {
+  if (!defined(structuralMetadata)) {
+    return undefined;
+  }
+  const propertyTextures = structuralMetadata.propertyTextures;
+  for (const propertyTexture of propertyTextures) {
+    const metadataClass = propertyTexture.class;
+    if (metadataClass.id === className) {
+      const properties = propertyTexture.properties;
+      const property = properties[propertyName];
+      if (defined(property)) {
+        return property;
+      }
+    }
+  }
+  // Note: This could check for property attributes in a similar
+  // way. But since picking arbitrary property attributes via the
+  // frame buffer is not supported yet, returning "undefined" here
+  // causes the picking to bail out early and safely when no
+  // property texture was found.
+  // See https://github.com/CesiumGS/cesium/issues/12225
+  return undefined;
+}
+
+export default getMetadataProperty;