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/zrender/lib/graphic/shape/Polygon.d.ts

@@ -0,0 +1,17 @@
+import Path, { PathProps } from '../Path';
+import { VectorArray } from '../../core/vector';
+export declare class PolygonShape {
+    points: VectorArray[];
+    smooth?: number;
+    smoothConstraint?: VectorArray[];
+}
+export interface PolygonProps extends PathProps {
+    shape?: Partial<PolygonShape>;
+}
+declare class Polygon extends Path<PolygonProps> {
+    shape: PolygonShape;
+    constructor(opts?: PolygonProps);
+    getDefaultShape(): PolygonShape;
+    buildPath(ctx: CanvasRenderingContext2D, shape: PolygonShape): void;
+}
+export default Polygon;