fix(monitor): correct timezone conversion in monitor charts

Changes:
- Correct time label parsing in hourly model request distribution chart
- Correct time label parsing in hourly token usage chart
- Mark ISO time strings as UTC to enable proper browser conversion to user's local time

Modified files:
- src/components/monitor/HourlyModelChart.tsx (modified)
- src/components/monitor/HourlyTokenChart.tsx (modified)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/monitor/HourlyModelChart.tsx

@@ -127,7 +127,7 @@ export function HourlyModelChart({ data, loading, isDark }: HourlyModelChartProp
   // 图表数据
   const chartData = useMemo(() => {
     const labels = hourlyData.hours.map((hour) => {
-      const date = new Date(hour + ':00:00');
+      const date = new Date(hour + ':00:00Z'); // 添加 Z 表示 UTC 时间，确保正确转换为本地时间显示
       return `${date.getHours()}:00`;
     });
 

src/components/monitor/HourlyTokenChart.tsx

@@ -91,7 +91,7 @@ export function HourlyTokenChart({ data, loading, isDark }: HourlyTokenChartProp
   // 图表数据
   const chartData = useMemo(() => {
     const labels = hourlyData.hours.map((hour) => {
-      const date = new Date(hour + ':00:00');
+      const date = new Date(hour + ':00:00Z'); // 添加 Z 表示 UTC 时间，确保正确转换为本地时间显示
       return `${date.getHours()}:00`;
     });