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/leaflet/src/geo/crs/CRS.EPSG3857.js

@@ -0,0 +1,27 @@
+import {Earth} from './CRS.Earth';
+import {SphericalMercator} from '../projection/Projection.SphericalMercator';
+import {toTransformation} from '../../geometry/Transformation';
+import * as Util from '../../core/Util';
+
+/*
+ * @namespace CRS
+ * @crs L.CRS.EPSG3857
+ *
+ * The most common CRS for online maps, used by almost all free and commercial
+ * tile providers. Uses Spherical Mercator projection. Set in by default in
+ * Map's `crs` option.
+ */
+
+export var EPSG3857 = Util.extend({}, Earth, {
+	code: 'EPSG:3857',
+	projection: SphericalMercator,
+
+	transformation: (function () {
+		var scale = 0.5 / (Math.PI * SphericalMercator.R);
+		return toTransformation(scale, 0.5, -scale, 0.5);
+	}())
+});
+
+export var EPSG900913 = Util.extend({}, EPSG3857, {
+	code: 'EPSG:900913'
+});