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/ShadowMode.js

@@ -0,0 +1,80 @@
+/**
+ * Specifies whether the object casts or receives shadows from light sources when
+ * shadows are enabled.
+ *
+ * @enum {number}
+ */
+const ShadowMode = {
+  /**
+   * The object does not cast or receive shadows.
+   *
+   * @type {number}
+   * @constant
+   */
+  DISABLED: 0,
+
+  /**
+   * The object casts and receives shadows.
+   *
+   * @type {number}
+   * @constant
+   */
+  ENABLED: 1,
+
+  /**
+   * The object casts shadows only.
+   *
+   * @type {number}
+   * @constant
+   */
+  CAST_ONLY: 2,
+
+  /**
+   * The object receives shadows only.
+   *
+   * @type {number}
+   * @constant
+   */
+  RECEIVE_ONLY: 3,
+};
+
+/**
+ * @private
+ */
+ShadowMode.NUMBER_OF_SHADOW_MODES = 4;
+
+/**
+ * @private
+ */
+ShadowMode.castShadows = function (shadowMode) {
+  return (
+    shadowMode === ShadowMode.ENABLED || shadowMode === ShadowMode.CAST_ONLY
+  );
+};
+
+/**
+ * @private
+ */
+ShadowMode.receiveShadows = function (shadowMode) {
+  return (
+    shadowMode === ShadowMode.ENABLED || shadowMode === ShadowMode.RECEIVE_ONLY
+  );
+};
+
+/**
+ * @private
+ */
+ShadowMode.fromCastReceive = function (castShadows, receiveShadows) {
+  if (castShadows && receiveShadows) {
+    return ShadowMode.ENABLED;
+  } else if (castShadows) {
+    return ShadowMode.CAST_ONLY;
+  } else if (receiveShadows) {
+    return ShadowMode.RECEIVE_ONLY;
+  }
+  return ShadowMode.DISABLED;
+};
+
+Object.freeze(ShadowMode);
+
+export default ShadowMode;