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/axios/lib/platform/browser/classes/Blob.js

@@ -0,0 +1,3 @@
+'use strict';
+
+export default typeof Blob !== 'undefined' ? Blob : null;

frontend/node_modules/axios/lib/platform/browser/classes/FormData.js

@@ -0,0 +1,3 @@
+'use strict';
+
+export default typeof FormData !== 'undefined' ? FormData : null;

frontend/node_modules/axios/lib/platform/browser/classes/URLSearchParams.js

@@ -0,0 +1,4 @@
+'use strict';
+
+import AxiosURLSearchParams from '../../../helpers/AxiosURLSearchParams.js';
+export default typeof URLSearchParams !== 'undefined' ? URLSearchParams : AxiosURLSearchParams;

frontend/node_modules/axios/lib/platform/browser/index.js

@@ -0,0 +1,13 @@
+import URLSearchParams from './classes/URLSearchParams.js';
+import FormData from './classes/FormData.js';
+import Blob from './classes/Blob.js';
+
+export default {
+  isBrowser: true,
+  classes: {
+    URLSearchParams,
+    FormData,
+    Blob,
+  },
+  protocols: ['http', 'https', 'file', 'blob', 'url', 'data'],
+};