manual check in/check out

implemented, to be implemented: qrcode or/and geofence

apps/admin/src/app/api/health/route.ts

@@ -0,0 +1,5 @@
+import { NextResponse } from 'next/server'
+
+export async function GET() {
+    return NextResponse.json({ status: 'ok', timestamp: new Date().toISOString() })
+}