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/ui/Badge.tsx

@@ -0,0 +1,29 @@
+import type { TransactionType } from '@/lib/types';
+
+const TYPE_LABELS: Record<TransactionType, string> = {
+  earn: 'Начисление',
+  spend: 'Списание',
+  admin_grant: 'Начисление',
+  expire: 'Сгорание',
+};
+
+const TYPE_CLASSES: Record<TransactionType, string> = {
+  earn: 'bg-green-900/50 text-green-400',
+  spend: 'bg-red-900/50 text-red-400',
+  admin_grant: 'bg-blue-900/50 text-blue-400',
+  expire: 'bg-gray-700 text-gray-400',
+};
+
+interface BadgeProps {
+  type: TransactionType;
+}
+
+export function Badge({ type }: BadgeProps) {
+  return (
+    <span
+      className={`inline-flex shrink-0 items-center rounded-full px-2 py-0.5 text-xs font-medium ${TYPE_CLASSES[type]}`}
+    >
+      {TYPE_LABELS[type]}
+    </span>
+  );
+}

frontend/components/ui/Button.tsx

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+import { type ButtonHTMLAttributes } from 'react';
+
+type Variant = 'primary' | 'secondary' | 'ghost';
+
+interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  variant?: Variant;
+  isLoading?: boolean;
+}
+
+const VARIANT_CLASSES: Record<Variant, string> = {
+  primary: 'bg-blue-600 text-white hover:bg-blue-500 disabled:bg-blue-800 disabled:text-blue-400',
+  secondary: 'bg-gray-700 text-gray-200 hover:bg-gray-600 disabled:opacity-50',
+  ghost: 'bg-transparent text-blue-400 hover:bg-gray-700 disabled:opacity-50',
+};
+
+export function Button({
+  variant = 'primary',
+  isLoading = false,
+  disabled,
+  children,
+  className = '',
+  ...props
+}: ButtonProps) {
+  return (
+    <button
+      disabled={disabled ?? isLoading}
+      className={`inline-flex items-center justify-center gap-2 rounded-lg px-4 py-2 text-sm font-medium transition-colors focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 focus:ring-offset-gray-900 ${VARIANT_CLASSES[variant]} ${className}`}
+      {...props}
+    >
+      {isLoading && (
+        <span className="h-4 w-4 animate-spin rounded-full border-2 border-current border-t-transparent" />
+      )}
+      {children}
+    </button>
+  );
+}

frontend/components/ui/Card.tsx

@@ -0,0 +1,16 @@
+import { type HTMLAttributes } from 'react';
+
+interface CardProps extends HTMLAttributes<HTMLDivElement> {
+  children: React.ReactNode;
+}
+
+export function Card({ children, className = '', ...props }: CardProps) {
+  return (
+    <div
+      className={`rounded-2xl bg-gray-800 p-6 shadow-sm ring-1 ring-gray-700 ${className}`}
+      {...props}
+    >
+      {children}
+    </div>
+  );
+}

frontend/components/ui/Input.tsx

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+import { type InputHTMLAttributes, useId } from 'react';
+
+interface InputProps extends InputHTMLAttributes<HTMLInputElement> {
+  label: string;
+  error?: string;
+}
+
+export function Input({ label, error, className = '', ...props }: InputProps) {
+  const id = useId();
+  return (
+    <div className="flex flex-col gap-1">
+      <label htmlFor={id} className="text-sm font-medium text-gray-300">
+        {label}
+      </label>
+      <input
+        id={id}
+        className={`rounded-lg border bg-gray-700 px-3 py-2 text-sm text-white placeholder-gray-500 outline-none transition-colors focus:ring-2 ${error ? 'border-red-500 focus:border-red-500 focus:ring-red-800' : 'border-gray-600 focus:border-blue-500 focus:ring-blue-900'} ${className}`}
+        {...props}
+      />
+      {error && <p className="text-xs text-red-400">{error}</p>}
+    </div>
+  );
+}

frontend/components/ui/Spinner.tsx

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+interface SpinnerProps {
+  size?: 'sm' | 'md' | 'lg';
+  className?: string;
+}
+
+const SIZE_CLASSES = {
+  sm: 'h-4 w-4 border-2',
+  md: 'h-8 w-8 border-2',
+  lg: 'h-12 w-12 border-4',
+};
+
+export function Spinner({ size = 'md', className = '' }: SpinnerProps) {
+  return (
+    <div
+      role="status"
+      aria-label="Загрузка"
+      className={`animate-spin rounded-full border-blue-600 border-t-transparent ${SIZE_CLASSES[size]} ${className}`}
+    />
+  );
+}

frontend/components/ui/index.ts

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+export { Button } from './Button';
+export { Input } from './Input';
+export { Card } from './Card';
+export { Badge } from './Badge';
+export { Spinner } from './Spinner';