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/lodash/unescape.js

@@ -0,0 +1,34 @@
+var toString = require('./toString'),
+    unescapeHtmlChar = require('./_unescapeHtmlChar');
+
+/** Used to match HTML entities and HTML characters. */
+var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
+    reHasEscapedHtml = RegExp(reEscapedHtml.source);
+
+/**
+ * The inverse of `_.escape`; this method converts the HTML entities
+ * `&`, `<`, `>`, `"`, and `'` in `string` to
+ * their corresponding characters.
+ *
+ * **Note:** No other HTML entities are unescaped. To unescape additional
+ * HTML entities use a third-party library like [_he_](https://mths.be/he).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.6.0
+ * @category String
+ * @param {string} [string=''] The string to unescape.
+ * @returns {string} Returns the unescaped string.
+ * @example
+ *
+ * _.unescape('fred, barney, & pebbles');
+ * // => 'fred, barney, & pebbles'
+ */
+function unescape(string) {
+  string = toString(string);
+  return (string && reHasEscapedHtml.test(string))
+    ? string.replace(reEscapedHtml, unescapeHtmlChar)
+    : string;
+}
+
+module.exports = unescape;