feat(EnamellingMachineStatus): 添加历史数据降采样功能

当查询时间范围超过一周时，自动对历史数据进行降采样处理，仅保留关键时间点的数据。添加了日期范围判断和降采样工具函数，减少大数据量时的渲染压力。

src/views/plan/EnamellingMachineStatus.vue

@@ -299,6 +299,60 @@ const equipmentAxlesMap = {
   'QB034': ['左边', '右边']
 };
 
+const isMoreThanOneWeek = (startDate, endDate) => {
+  if (!startDate || !endDate) return false;
+  const start = new Date(startDate);
+  const end = new Date(endDate);
+  const diffDays = (end - start) / (1000 * 60 * 60 * 24);
+  return diffDays > 7;
+};
+
+const downsampleHistoryToKeyTimes = (records, targetHours = [8, 12, 16, 18]) => {
+  if (!records?.length) return [];
+
+  const groups = new Map();
+  records.forEach(item => {
+    const dt = new Date(item.create_time);
+    const dateKey = dt.toISOString().split('T')[0];
+    if (!groups.has(dateKey)) groups.set(dateKey, []);
+    groups.get(dateKey).push({ dt, item });
+  });
+
+  const result = [];
+
+  groups.forEach((items, dateKey) => {
+    items.sort((a, b) => a.dt - b.dt);
+
+    const selected = new Map();
+
+    targetHours.forEach(targetH => {
+      let closest = null;
+      let minDiff = Infinity;
+
+      items.forEach(({ dt, item }) => {
+        const diff = Math.abs((dt.getHours() - targetH) * 60 + dt.getMinutes());
+        if (diff < minDiff) {
+          minDiff = diff;
+          closest = item;
+        }
+      });
+
+      if (closest && minDiff <= 90) {
+        selected.set(targetH, closest);
+      }
+    });
+
+    targetHours.forEach(h => {
+      if (selected.has(h)) {
+        result.push(selected.get(h));
+      }
+    });
+  });
+
+  result.sort((a, b) => new Date(a.create_time) - new Date(b.create_time));
+  return result;
+};
+
 // 判断是否应该显示轴
 const shouldShowAxle = (degree) => {
   if (!degree) return false;
@@ -512,8 +566,16 @@ const fetchHistoryData = (model, specification, wireDisc) => {
     .then(response => response.json())
     .then(data => {
       if (data.code === 200 && data.data && data.data.records) {
-        historyData.value = data.data.records;
-        hasHistoryData.value = historyData.value.length > 0;
+        let records = data.data.records;
+
+        if (isMoreThanOneWeek(dateRange.start_date, dateRange.end_date)) {
+          const beforeCount = records.length;
+          records = downsampleHistoryToKeyTimes(records);
+          console.log(`库存数据降采样：${beforeCount} → ${records.length} 条 (时间范围超过1周)`);
+        }
+
+        historyData.value = records;
+        hasHistoryData.value = records.length > 0;
         
         nextTick(() => {
           setTimeout(() => {