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>

.github/workflows/frontend-ci.yml

@@ -0,0 +1,39 @@
+name: Frontend CI
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+jobs:
+  lint-typecheck-build:
+    name: Lint, Type-check & Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install dependencies
+        working-directory: frontend
+        run: npm ci
+
+      - name: Type check
+        working-directory: frontend
+        run: npx tsc --noEmit
+
+      - name: ESLint
+        working-directory: frontend
+        run: npx eslint .
+
+      - name: Build
+        working-directory: frontend
+        env:
+          NEXT_PUBLIC_API_URL: http://localhost:8080
+        run: npm run build