refactor(repo): consolidate openflare-server to root and move subprojects to internal/apps

- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.

frontend/app/(main)/nodes/components/network-trend-chart.tsx

@@ -0,0 +1,57 @@
+'use client';
+
+import {TrendChart} from '@/components/data/trend-chart';
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from '@/components/ui/card';
+import type {NetworkTrendPoint} from '@/lib/services/openflare';
+
+import {
+  formatBytesPerSecond,
+  formatTrendHour,
+} from '../../components/dashboard/dashboard-utils';
+
+export function NetworkTrendChart({
+  points,
+  title = '24 小时网络趋势',
+  description = '观察 OpenResty 入站/出站吞吐的变化，辅助识别回源压力、突发流量或出口异常。',
+}: {
+  points: NetworkTrendPoint[];
+  title?: string;
+  description?: string;
+}) {
+  return (
+    <Card className="border-dashed shadow-none">
+      <CardHeader>
+        <CardTitle className="text-sm font-semibold">{title}</CardTitle>
+        <CardDescription className="text-xs">{description}</CardDescription>
+      </CardHeader>
+      <CardContent>
+        <TrendChart
+          labels={points.map((point) => formatTrendHour(point.bucket_started_at))}
+          yAxisValueFormatter={(value) => formatBytesPerSecond(value, 3600)}
+          series={[
+            {
+              label: 'OpenResty 入站',
+              color: '#22c55e',
+              fillColor: 'rgba(34, 197, 94, 0.14)',
+              variant: 'area',
+              values: points.map((point) => point.openresty_rx_bytes),
+              valueFormatter: (value) => formatBytesPerSecond(value, 3600),
+            },
+            {
+              label: 'OpenResty 出站',
+              color: '#38bdf8',
+              values: points.map((point) => point.openresty_tx_bytes),
+              valueFormatter: (value) => formatBytesPerSecond(value, 3600),
+            },
+          ]}
+        />
+      </CardContent>
+    </Card>
+  );
+}