Split admin dashboard, implement user and booking search

backend/main.go

@@ -132,6 +132,12 @@ func main() {
 				r.Get("/{id}", bookings.GetAdminBookingHandler)
 				r.Put("/{id}/progress", bookings.ProgressBookingHandler)
 				r.Post("/{id}/confirm", bookings.ConfirmBookingHandler)
+				r.Post("/{id}/cancel", bookings.ConfirmBookingHandler)
+			})
+
+			r.Route("/admin/users", func(r chi.Router) {
+				r.Get("/", user.ListAdminUsersHandler)
+				r.Get("/{id}", user.GetAdminUserHandler)
 			})
 
 			// --- Admin Notifications ---