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/pako/lib/utils/common.js

@@ -0,0 +1,48 @@
+'use strict';
+
+
+const _has = (obj, key) => {
+  return Object.prototype.hasOwnProperty.call(obj, key);
+};
+
+module.exports.assign = function (obj /*from1, from2, from3, ...*/) {
+  const sources = Array.prototype.slice.call(arguments, 1);
+  while (sources.length) {
+    const source = sources.shift();
+    if (!source) { continue; }
+
+    if (typeof source !== 'object') {
+      throw new TypeError(source + 'must be non-object');
+    }
+
+    for (const p in source) {
+      if (_has(source, p)) {
+        obj[p] = source[p];
+      }
+    }
+  }
+
+  return obj;
+};
+
+
+// Join array of chunks to single array.
+module.exports.flattenChunks = (chunks) => {
+  // calculate data length
+  let len = 0;
+
+  for (let i = 0, l = chunks.length; i < l; i++) {
+    len += chunks[i].length;
+  }
+
+  // join chunks
+  const result = new Uint8Array(len);
+
+  for (let i = 0, pos = 0, l = chunks.length; i < l; i++) {
+    let chunk = chunks[i];
+    result.set(chunk, pos);
+    pos += chunk.length;
+  }
+
+  return result;
+};