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/trimEnd.js

@@ -0,0 +1,41 @@
+var baseToString = require('./_baseToString'),
+    castSlice = require('./_castSlice'),
+    charsEndIndex = require('./_charsEndIndex'),
+    stringToArray = require('./_stringToArray'),
+    toString = require('./toString'),
+    trimmedEndIndex = require('./_trimmedEndIndex');
+
+/**
+ * Removes trailing whitespace or specified characters from `string`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category String
+ * @param {string} [string=''] The string to trim.
+ * @param {string} [chars=whitespace] The characters to trim.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {string} Returns the trimmed string.
+ * @example
+ *
+ * _.trimEnd('  abc  ');
+ * // => '  abc'
+ *
+ * _.trimEnd('-_-abc-_-', '_-');
+ * // => '-_-abc'
+ */
+function trimEnd(string, chars, guard) {
+  string = toString(string);
+  if (string && (guard || chars === undefined)) {
+    return string.slice(0, trimmedEndIndex(string) + 1);
+  }
+  if (!string || !(chars = baseToString(chars))) {
+    return string;
+  }
+  var strSymbols = stringToArray(string),
+      end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;
+
+  return castSlice(strSymbols, 0, end).join('');
+}
+
+module.exports = trimEnd;