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/Renderer/freezeRenderState.js

@@ -0,0 +1,30 @@
+/**
+ * Returns frozen renderState as well as all of the object literal properties. This function is deep object freeze
+ * function ignoring properties named "_applyFunctions".
+ *
+ * @private
+ *
+ * @param {object} renderState
+ * @returns {object} Returns frozen renderState.
+ *
+ */
+function freezeRenderState(renderState) {
+  if (typeof renderState !== "object" || renderState === null) {
+    return renderState;
+  }
+
+  let propName;
+  const propNames = Object.keys(renderState);
+
+  for (let i = 0; i < propNames.length; i++) {
+    propName = propNames[i];
+    if (
+      renderState.hasOwnProperty(propName) &&
+      propName !== "_applyFunctions"
+    ) {
+      renderState[propName] = freezeRenderState(renderState[propName]);
+    }
+  }
+  return Object.freeze(renderState);
+}
+export default freezeRenderState;