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/protobufjs/ext/textformat.d.ts

@@ -0,0 +1,19 @@
+import * as $protobuf from "..";
+import { ITextFormatOptions } from "./textformat.generated";
+
+export * from "./textformat.generated";
+
+declare module ".." {
+    namespace textformat {
+        /** Maximum recursion depth for formatting length-delimited unknown fields. */
+        let unknownRecursionLimit: number;
+    }
+
+    interface Type {
+        /** Installed by `textformat.install()`. Parses this type from protobuf text format. */
+        fromText(text: string): $protobuf.Message<{}>;
+
+        /** Installed by `textformat.install()`. Formats a message of this type as protobuf text format. */
+        toText(message: ($protobuf.Message<{}>|{ [k: string]: any }), options?: ITextFormatOptions): string;
+    }
+}