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/BlendEquation.js

@@ -0,0 +1,58 @@
+// @ts-check
+
+import WebGLConstants from "../Core/WebGLConstants.js";
+
+/**
+ * Determines how two pixels' values are combined.
+ *
+ * @enum {number}
+ */
+const BlendEquation = {
+  /**
+   * Pixel values are added componentwise.  This is used in additive blending for translucency.
+   *
+   * @type {number}
+   * @constant
+   */
+  ADD: WebGLConstants.FUNC_ADD,
+
+  /**
+   * Pixel values are subtracted componentwise (source - destination).  This is used in alpha blending for translucency.
+   *
+   * @type {number}
+   * @constant
+   */
+  SUBTRACT: WebGLConstants.FUNC_SUBTRACT,
+
+  /**
+   * Pixel values are subtracted componentwise (destination - source).
+   *
+   * @type {number}
+   * @constant
+   */
+  REVERSE_SUBTRACT: WebGLConstants.FUNC_REVERSE_SUBTRACT,
+
+  /**
+   * Pixel values are given to the minimum function (min(source, destination)).
+   *
+   * This equation operates on each pixel color component.
+   *
+   * @type {number}
+   * @constant
+   */
+  MIN: WebGLConstants.MIN,
+
+  /**
+   * Pixel values are given to the maximum function (max(source, destination)).
+   *
+   * This equation operates on each pixel color component.
+   *
+   * @type {number}
+   * @constant
+   */
+  MAX: WebGLConstants.MAX,
+};
+
+Object.freeze(BlendEquation);
+
+export default BlendEquation;