Overhaul: real metrics, Git integration UI, open-source hygiene, root cleanup

Backend:
- GET /services/:id/metrics with real Docker container stats
- DELETE /git/providers/:id and GET repo branches endpoint

Frontend:
- Service detail shows real telemetry or honest empty states
- Live status distinguishes idle/polling/reconnecting
- Git providers section in Settings; repo+branch pickers in Add Service
- Real logo, compact Projects header, canvas fitView fix
- index.css deduplicated (1725 -> 1384 lines)
- Fixed smoke tests, lint errors, ToastProvider/context unification

Repo hygiene:
- Added LICENSE (MIT), CONTRIBUTING.md, SECURITY.md; rewrote README
- Untracked .env.prod and data/letsencrypt secrets; fixed .gitignore
- Removed legacy root src/internal/cmd and stale configs/docs/artifacts
- Moved guides and design references under docs/

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/frontend/src/lib/time.ts

@@ -36,6 +36,16 @@ export function formatDate(iso?: string): string {
   return dt.toLocaleString();
 }
 
+export function formatBytes(bytes: number): string {
+  if (!Number.isFinite(bytes) || bytes <= 0) {
+    return '0 B';
+  }
+  const units = ['B', 'KiB', 'MiB', 'GiB', 'TiB'];
+  const index = Math.min(units.length - 1, Math.floor(Math.log(bytes) / Math.log(1024)));
+  const value = bytes / Math.pow(1024, index);
+  return `${value >= 100 ? Math.round(value) : value.toFixed(1)} ${units[index]}`;
+}
+
 export function seededMetric(seed: string, min: number, max: number): number {
   let hash = 0;
   for (let idx = 0; idx < seed.length; idx += 1) {