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/axios/lib/helpers/trackStream.js

@@ -0,0 +1,89 @@
+export const streamChunk = function* (chunk, chunkSize) {
+  let len = chunk.byteLength;
+
+  if (!chunkSize || len < chunkSize) {
+    yield chunk;
+    return;
+  }
+
+  let pos = 0;
+  let end;
+
+  while (pos < len) {
+    end = pos + chunkSize;
+    yield chunk.slice(pos, end);
+    pos = end;
+  }
+};
+
+export const readBytes = async function* (iterable, chunkSize) {
+  for await (const chunk of readStream(iterable)) {
+    yield* streamChunk(chunk, chunkSize);
+  }
+};
+
+const readStream = async function* (stream) {
+  if (stream[Symbol.asyncIterator]) {
+    yield* stream;
+    return;
+  }
+
+  const reader = stream.getReader();
+  try {
+    for (;;) {
+      const { done, value } = await reader.read();
+      if (done) {
+        break;
+      }
+      yield value;
+    }
+  } finally {
+    await reader.cancel();
+  }
+};
+
+export const trackStream = (stream, chunkSize, onProgress, onFinish) => {
+  const iterator = readBytes(stream, chunkSize);
+
+  let bytes = 0;
+  let done;
+  let _onFinish = (e) => {
+    if (!done) {
+      done = true;
+      onFinish && onFinish(e);
+    }
+  };
+
+  return new ReadableStream(
+    {
+      async pull(controller) {
+        try {
+          const { done, value } = await iterator.next();
+
+          if (done) {
+            _onFinish();
+            controller.close();
+            return;
+          }
+
+          let len = value.byteLength;
+          if (onProgress) {
+            let loadedBytes = (bytes += len);
+            onProgress(loadedBytes);
+          }
+          controller.enqueue(new Uint8Array(value));
+        } catch (err) {
+          _onFinish(err);
+          throw err;
+        }
+      },
+      cancel(reason) {
+        _onFinish(reason);
+        return iterator.return();
+      },
+    },
+    {
+      highWaterMark: 2,
+    }
+  );
+};