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/internal/partners/handler.go

@@ -0,0 +1,35 @@
+// Package partners handles the public partner listing endpoint.
+package partners
+
+import (
+	"log/slog"
+	"net/http"
+
+	"github.com/cu-points/backend/pkg/response"
+)
+
+// Handler holds HTTP handler methods for the partners domain.
+type Handler struct {
+	service *Service
+}
+
+// NewHandler creates a new partners Handler.
+func NewHandler(service *Service) *Handler {
+	return &Handler{service: service}
+}
+
+// List handles GET /api/v1/partners.
+// Returns all active partners. This endpoint is publicly accessible (no auth required).
+func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
+	partners, err := h.service.ListActive(r.Context())
+	if err != nil {
+		slog.Error("handler.List", "err", err)
+		response.Error(w, http.StatusInternalServerError, "internal server error")
+		return
+	}
+	// Return an empty array rather than null when there are no partners.
+	if partners == nil {
+		partners = []Partner{}
+	}
+	response.JSON(w, http.StatusOK, partners)
+}