feat: multi-subscription frontend support

- Add SubscriptionListItem and SubscriptionsListResponse types
- Add getSubscriptions/getSubscriptionById API methods
- Add optional subscriptionId parameter to all 30+ API methods
- Create /subscriptions page with subscription list cards
- Add /subscription/:subscriptionId route for per-subscription management
- Dashboard: show multi-tariff navigation block when user has 2+ subscriptions
- Subscription page: read subscriptionId from URL params, pass to all queries
- SubscriptionPurchase: accept subscriptionId from query params
- SubscriptionCardExpired: pass subscription.id to API calls
- Full backward compatibility: without subscriptionId, works as before

src/components/dashboard/SubscriptionCardExpired.tsx

@@ -57,12 +57,12 @@ export default function SubscriptionCardExpired({
     try {
       if (isDisabledDaily) {
         // Resume daily subscription via toggle pause endpoint
-        await subscriptionApi.togglePause();
+        await subscriptionApi.togglePause(subscription.id);
       } else if (isDaily && subscription.tariff_id) {
         // Expired daily tariff — purchase for 1 day
         await subscriptionApi.purchaseTariff(subscription.tariff_id, 1);
       } else {
-        await subscriptionApi.renewSubscription(30);
+        await subscriptionApi.renewSubscription(30, subscription.id);
       }
       haptic.success();
       queryClient.invalidateQueries({ queryKey: ['subscription'] });