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/entities/dist/commonjs/decode-codepoint.d.ts

@@ -0,0 +1,19 @@
+/**
+ * Polyfill for `String.fromCodePoint`. It is used to create a string from a Unicode code point.
+ */
+export declare const fromCodePoint: (...codePoints: number[]) => string;
+/**
+ * Replace the given code point with a replacement character if it is a
+ * surrogate or is outside the valid range. Otherwise return the code
+ * point unchanged.
+ */
+export declare function replaceCodePoint(codePoint: number): number;
+/**
+ * Replace the code point if relevant, then convert it to a string.
+ *
+ * @deprecated Use `fromCodePoint(replaceCodePoint(codePoint))` instead.
+ * @param codePoint The code point to decode.
+ * @returns The decoded code point.
+ */
+export declare function decodeCodePoint(codePoint: number): string;
+//# sourceMappingURL=decode-codepoint.d.ts.map