fix: add missing balance cache invalidation after mutations

- Subscription.tsx: devicePurchase + trafficPurchase onSuccess → invalidate ['balance']
- RenewSubscription.tsx: renewMutation onSuccess → invalidate ['balance']
- SubscriptionPurchase.tsx: purchaseMutation onSuccess → invalidate ['balance'] + ['subscriptions-list']
- subscription.ts: refreshTraffic uses withSubId (already fixed, formatting)

src/api/subscription.ts

@@ -158,7 +158,8 @@ export const subscriptionApi = {
   }> => {
     const response = await apiClient.post(
       '/cabinet/subscription/refresh-traffic',
-      subscriptionId != null ? { subscription_id: subscriptionId } : undefined,
+      {},
+      withSubId(subscriptionId),
     );
     return response.data;
   },