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/lodash-es/math.default.js

@@ -0,0 +1,21 @@
+import add from './add.js';
+import ceil from './ceil.js';
+import divide from './divide.js';
+import floor from './floor.js';
+import max from './max.js';
+import maxBy from './maxBy.js';
+import mean from './mean.js';
+import meanBy from './meanBy.js';
+import min from './min.js';
+import minBy from './minBy.js';
+import multiply from './multiply.js';
+import round from './round.js';
+import subtract from './subtract.js';
+import sum from './sum.js';
+import sumBy from './sumBy.js';
+
+export default {
+  add, ceil, divide, floor, max,
+  maxBy, mean, meanBy, min, minBy,
+  multiply, round, subtract, sum, sumBy
+};