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/Shaders/EllipsoidVS.glsl

@@ -0,0 +1,28 @@
+in vec3 position;
+
+uniform vec3 u_radii;
+
+out vec3 v_positionEC;
+
+void main()
+{
+    // In the vertex data, the cube goes from (-1.0, -1.0, -1.0) to (1.0, 1.0, 1.0) in model coordinates.
+    // Scale to consider the radii.  We could also do this once on the CPU when using the BoxGeometry,
+    // but doing it here allows us to change the radii without rewriting the vertex data, and
+    // allows all ellipsoids to reuse the same vertex data.
+    vec4 p = vec4(u_radii * position, 1.0);
+    
+    vec4 pEC = czm_modelView * p;
+    v_positionEC = pEC.xyz;     // position in eye coordinates
+    gl_Position = czm_projection * pEC;
+    // With multi-frustum, when the ellipsoid primitive is positioned on the intersection of two frustums
+    // and close to terrain, the terrain (writes depth) in the closest frustum can overwrite part of the
+    // ellipsoid (does not write depth) that was rendered in the farther frustum.
+    //
+    // Here, we clamp the depth in the vertex shader to avoid being overwritten; however, this creates
+    // artifacts since some fragments can be alpha blended twice.  This is solved by only rendering
+    // the ellipsoid in the closest frustum to the viewer.
+    gl_Position.z = clamp(gl_Position.z, czm_depthRange.near, czm_depthRange.far);
+
+    czm_vertexLogDepth();
+}