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>

backend/.air.toml

@@ -0,0 +1,8 @@
+[build]
+  cmd     = "go build -o ./tmp/main ./cmd/api"
+  bin     = "./tmp/main"
+  include_ext = ["go"]
+  exclude_dir = ["tmp", "vendor"]
+
+[misc]
+  clean_on_exit = true