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)/components/dashboard/dashboard-utils.ts

@@ -0,0 +1,15 @@
+export {
+  calculateNiceAxisMax,
+  formatBytes,
+  formatBytesPerSecond,
+  formatCompactNumber,
+  formatPercent,
+} from '@/lib/utils/metrics';
+
+export function formatTrendHour(value: string) {
+  const date = new Date(value);
+  if (Number.isNaN(date.getTime())) {
+    return '—';
+  }
+  return `${date.getHours().toString().padStart(2, '0')}:00`;
+}