chore: initial project scaffold with admin web, backend, desktop client, and deployment setup

Add monorepo structure for NexaVPN WireGuard control plane including:
- .gitignore for node_modules, build artifacts, and environment files
- README with project overview, monorepo layout, and quick start guide
- Admin web UI with React, Vite, TypeScript, and nginx reverse proxy
- API client with type definitions for users, devices, policies, gateways, and audit logs
- Admin pages for dashboard, users, devices, policies, g

backend/internal/audit/handler.go

@@ -0,0 +1,25 @@
+package audit
+
+import (
+	"net/http"
+
+	"github.com/nexavpn/nexavpn/backend/internal/apiutil"
+)
+
+type Handler struct {
+	service *Service
+}
+
+func NewHandler(service *Service) *Handler {
+	return &Handler{service: service}
+}
+
+func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
+	items, err := h.service.List(r.Context(), 100)
+	if err != nil {
+		apiutil.Error(w, http.StatusInternalServerError, "audit_list_failed", "unable to list audit logs")
+		return
+	}
+
+	apiutil.JSON(w, http.StatusOK, items)
+}