fix(openflare): ClickHouse count scan and dashboard traffic metrics

- Scan ClickHouse count()/countIf() aggregates as uint64 before int64 conversion
- Fix access log list count, region stats, and delete pre-count queries
- Aggregate dashboard 24h traffic totals from hourly trend buckets
- Show current hour value in traffic trend chart summary
- Rename docker-compose service to openflare
- Remove redundant config preview section from performance page

frontend/app/(main)/components/dashboard/traffic-trend-chart.tsx

@@ -30,6 +30,8 @@ export function TrafficTrendChart({
       <CardContent>
         <TrendChart
           labels={points.map((point) => formatTrendHour(point.bucket_started_at))}
+          summaryScope="last-point"
+          summaryHint="当前小时"
           series={[
             {
               label: '请求量',