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/DepthFunction.js

@@ -0,0 +1,78 @@
+// @ts-check
+
+import WebGLConstants from "../Core/WebGLConstants.js";
+
+/**
+ * Determines the function used to compare two depths for the depth test.
+ *
+ * @enum {number}
+ */
+const DepthFunction = {
+  /**
+   * The depth test never passes.
+   *
+   * @type {number}
+   * @constant
+   */
+  NEVER: WebGLConstants.NEVER,
+
+  /**
+   * The depth test passes if the incoming depth is less than the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  LESS: WebGLConstants.LESS,
+
+  /**
+   * The depth test passes if the incoming depth is equal to the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  EQUAL: WebGLConstants.EQUAL,
+
+  /**
+   * The depth test passes if the incoming depth is less than or equal to the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  LESS_OR_EQUAL: WebGLConstants.LEQUAL,
+
+  /**
+   * The depth test passes if the incoming depth is greater than the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  GREATER: WebGLConstants.GREATER,
+
+  /**
+   * The depth test passes if the incoming depth is not equal to the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  NOT_EQUAL: WebGLConstants.NOTEQUAL,
+
+  /**
+   * The depth test passes if the incoming depth is greater than or equal to the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  GREATER_OR_EQUAL: WebGLConstants.GEQUAL,
+
+  /**
+   * The depth test always passes.
+   *
+   * @type {number}
+   * @constant
+   */
+  ALWAYS: WebGLConstants.ALWAYS,
+};
+
+Object.freeze(DepthFunction);
+
+export default DepthFunction;