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/features/builds/pages/BuildsPage.tsx

@@ -126,8 +126,11 @@ export function BuildsPage() {
     [isDemoMode, buildsQuery.data?.builds],
   );
 
-  const subscribedBuildIds = useMemo(() => builds.map((build) => build.id), [builds]);
-  const liveConnected = useBuildUpdates(subscribedBuildIds, ({ channel }) => {
+  const subscribedBuildIds = useMemo(
+    () => (isDemoMode ? [] : builds.map((build) => build.id)),
+    [isDemoMode, builds],
+  );
+  const liveStatus = useBuildUpdates(subscribedBuildIds, ({ channel }) => {
     queryClient.invalidateQueries({ queryKey: ['builds-page'] });
     queryClient.invalidateQueries({ queryKey: ['usage-builds'] });
     if (selectedBuild && channel === `build:${selectedBuild.id}`) {
@@ -149,9 +152,6 @@ export function BuildsPage() {
     queryFn: () => getBuildLogs(selectedBuild!.id),
   });
 
-  const isCancellingBuild = (buildId: string): boolean =>
-    cancelMutation.isPending && cancelMutation.variables === buildId;
-
   // Stats
   const stats = useMemo(() => {
     const running = builds.filter(b => b.status === 'running' || b.status === 'pending').length;
@@ -173,9 +173,9 @@ export function BuildsPage() {
 
             <div className="flex items-center gap-4">
               <div className="flex items-center gap-2 text-sm">
-                <div className={`w-2 h-2 rounded-full ${liveConnected ? 'bg-[var(--success)] animate-pulse' : 'bg-[var(--text-muted)]'}`} />
-                <span className={liveConnected ? 'text-[var(--success)]' : 'text-[var(--text-muted)]'}>
-                  {liveConnected ? 'Live' : 'Offline'}
+                <div className={`w-2 h-2 rounded-full ${liveStatus === 'live' ? 'bg-[var(--success)] animate-pulse' : 'bg-[var(--text-muted)]'}`} />
+                <span className={liveStatus === 'live' ? 'text-[var(--success)]' : 'text-[var(--text-muted)]'}>
+                  {liveStatus === 'live' ? 'Live' : liveStatus === 'offline' ? 'Reconnecting...' : 'Polling'}
                 </span>
               </div>
               <button