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-es/findKey.js

@@ -0,0 +1,44 @@
+import baseFindKey from './_baseFindKey.js';
+import baseForOwn from './_baseForOwn.js';
+import baseIteratee from './_baseIteratee.js';
+
+/**
+ * This method is like `_.find` except that it returns the key of the first
+ * element `predicate` returns truthy for instead of the element itself.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.1.0
+ * @category Object
+ * @param {Object} object The object to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {string|undefined} Returns the key of the matched element,
+ *  else `undefined`.
+ * @example
+ *
+ * var users = {
+ *   'barney':  { 'age': 36, 'active': true },
+ *   'fred':    { 'age': 40, 'active': false },
+ *   'pebbles': { 'age': 1,  'active': true }
+ * };
+ *
+ * _.findKey(users, function(o) { return o.age < 40; });
+ * // => 'barney' (iteration order is not guaranteed)
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.findKey(users, { 'age': 1, 'active': true });
+ * // => 'pebbles'
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.findKey(users, ['active', false]);
+ * // => 'fred'
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.findKey(users, 'active');
+ * // => 'barney'
+ */
+function findKey(object, predicate) {
+  return baseFindKey(object, baseIteratee(predicate, 3), baseForOwn);
+}
+
+export default findKey;