feat: initial commit — backend API + student cabinet frontend

- Go backend: auth (JWT), points earn/spend, QR token generation,
  partners, admin grant/stats endpoints with chi router
- Next.js 14 frontend: login, student dashboard, transaction history,
  QR display, partners list
- PostgreSQL migrations (4 tables), Redis cache, Docker Compose
- CORS middleware, role-based route protection, Zustand auth store

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/components/BalanceCard.tsx

@@ -0,0 +1,29 @@
+'use client';
+
+import { useRouter } from 'next/navigation';
+import { Card, Button } from '@/components/ui';
+import { formatPoints } from '@/lib/utils';
+
+interface BalanceCardProps {
+  balance: number;
+  name: string;
+}
+
+export function BalanceCard({ balance, name }: BalanceCardProps) {
+  const router = useRouter();
+
+  return (
+    <Card className="bg-gradient-to-br from-blue-700 to-blue-900 text-white ring-0 shadow-lg">
+      <p className="text-sm text-blue-200">{name}</p>
+      <p className="mt-2 text-5xl font-bold tracking-tight">{formatPoints(balance)}</p>
+      <p className="mt-1 text-sm text-blue-300">Доступно поинтов</p>
+      <Button
+        variant="secondary"
+        className="mt-5 bg-white/10 text-white hover:bg-white/20 border border-white/20"
+        onClick={() => router.push('/qr')}
+      >
+        Показать QR
+      </Button>
+    </Card>
+  );
+}