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/Source/Widgets/shared.css

@@ -0,0 +1,117 @@
+.cesium-svgPath-svg {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  overflow: hidden;
+}
+
+.cesium-button {
+  display: inline-block;
+  position: relative;
+  background: #303336;
+  border: 1px solid #444;
+  color: #edffff; /* For text buttons */
+  fill: #edffff; /* For SVG buttons */
+  border-radius: 4px;
+  padding: 5px 12px;
+  margin: 2px 3px;
+  cursor: pointer;
+  overflow: hidden;
+  -moz-user-select: none;
+  -webkit-user-select: none;
+  -ms-user-select: none;
+  user-select: none;
+}
+
+.cesium-button:focus {
+  color: #fff; /* For text buttons */
+  fill: #fff; /* For SVG buttons */
+  border-color: #ea4;
+  outline: none;
+}
+
+.cesium-button:hover {
+  color: #fff; /* For text buttons */
+  fill: #fff; /* For SVG buttons */
+  background: #48b;
+  border-color: #aef;
+  box-shadow: 0 0 8px #fff;
+}
+
+.cesium-button:active {
+  color: #000; /* For text buttons */
+  fill: #000; /* For SVG buttons */
+  background: #adf;
+  border-color: #fff;
+  box-shadow: 0 0 8px #fff;
+}
+
+.cesium-button:disabled,
+.cesium-button-disabled,
+.cesium-button-disabled:focus,
+.cesium-button-disabled:hover,
+.cesium-button-disabled:active {
+  background: #303336;
+  border-color: #444;
+  color: #646464; /* For text buttons */
+  fill: #646464; /* For SVG buttons */
+  box-shadow: none;
+  cursor: default;
+}
+
+.cesium-button option {
+  background-color: #000;
+  color: #eee;
+}
+
+.cesium-button option:disabled {
+  color: #777;
+}
+
+.cesium-button input,
+.cesium-button label {
+  cursor: pointer;
+}
+
+.cesium-button input {
+  vertical-align: sub;
+}
+
+.cesium-toolbar-button {
+  box-sizing: border-box;
+  width: 32px;
+  height: 32px;
+  border-radius: 14%;
+  padding: 0;
+  vertical-align: middle;
+  z-index: 0; /* Workaround for rounded raster image corners in Chrome */
+}
+
+.cesium-performanceDisplay-defaultContainer {
+  position: absolute;
+  top: 50px;
+  right: 10px;
+  text-align: right;
+}
+
+.cesium-performanceDisplay {
+  background-color: rgba(40, 40, 40, 0.7);
+  padding: 7px;
+  border-radius: 5px;
+  border: 1px solid #444;
+  font: bold 12px sans-serif;
+}
+
+.cesium-performanceDisplay-fps {
+  color: #e52;
+}
+
+.cesium-performanceDisplay-throttled {
+  color: #a42;
+}
+
+.cesium-performanceDisplay-ms {
+  color: #de3;
+}