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/BaseLayerPicker/BaseLayerPicker.css

@@ -0,0 +1,124 @@
+.cesium-baseLayerPicker-selected {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  border: none;
+}
+
+.cesium-baseLayerPicker-dropDown {
+  display: block;
+  position: absolute;
+  box-sizing: content-box;
+  top: auto;
+  right: 0;
+  width: 320px; /* Includes space needed for scrollbar */
+  max-height: 500px;
+  margin-top: 5px;
+  background-color: rgba(38, 38, 38, 0.75);
+  border: 1px solid #444;
+  padding: 6px;
+  overflow: auto;
+  border-radius: 10px;
+  -moz-user-select: none;
+  -webkit-user-select: none;
+  -ms-user-select: none;
+  user-select: none;
+  transform: translate(0, -20%);
+  visibility: hidden;
+  opacity: 0;
+  transition:
+    visibility 0s 0.2s,
+    opacity 0.2s ease-in,
+    transform 0.2s ease-in;
+}
+
+.cesium-baseLayerPicker-dropDown-visible {
+  transform: translate(0, 0);
+  visibility: visible;
+  opacity: 1;
+  transition:
+    opacity 0.2s ease-out,
+    transform 0.2s ease-out;
+}
+
+.cesium-baseLayerPicker-sectionTitle {
+  display: block;
+  font-family: sans-serif;
+  font-size: 16pt;
+  text-align: left;
+  color: #edffff;
+  margin-bottom: 4px;
+}
+
+.cesium-baseLayerPicker-choices {
+  margin-bottom: 5px;
+}
+
+.cesium-baseLayerPicker-categoryTitle {
+  color: #edffff;
+  font-size: 11pt;
+}
+
+.cesium-baseLayerPicker-choices {
+  display: block;
+  border: 1px solid #888;
+  border-radius: 5px;
+  padding: 5px 0;
+}
+
+.cesium-baseLayerPicker-item {
+  display: inline-block;
+  vertical-align: top;
+  margin: 2px 5px;
+  width: 64px;
+  text-align: center;
+  cursor: pointer;
+}
+
+.cesium-baseLayerPicker-itemLabel {
+  display: block;
+  font-family: sans-serif;
+  font-size: 8pt;
+  text-align: center;
+  vertical-align: middle;
+  color: #edffff;
+  cursor: pointer;
+  word-wrap: break-word;
+}
+
+.cesium-baseLayerPicker-item:hover .cesium-baseLayerPicker-itemLabel,
+.cesium-baseLayerPicker-item:focus .cesium-baseLayerPicker-itemLabel {
+  text-decoration: underline;
+}
+
+.cesium-baseLayerPicker-itemIcon {
+  display: inline-block;
+  position: relative;
+  width: inherit;
+  height: auto;
+  background-size: 100% 100%;
+  border: solid 1px #444;
+  border-radius: 9px;
+  color: #edffff;
+  margin: 0;
+  padding: 0;
+  cursor: pointer;
+  box-sizing: border-box;
+}
+
+.cesium-baseLayerPicker-item:hover .cesium-baseLayerPicker-itemIcon {
+  border-color: #fff;
+  box-shadow:
+    0 0 8px #fff,
+    0 0 8px #fff;
+}
+
+.cesium-baseLayerPicker-selectedItem .cesium-baseLayerPicker-itemLabel {
+  color: rgb(189, 236, 248);
+}
+
+.cesium-baseLayerPicker-selectedItem .cesium-baseLayerPicker-itemIcon {
+  border: double 4px rgb(189, 236, 248);
+}