fix(subscription): forward subscription_id to purchaseTariff to fix renew race

Companion to bedolaga-bot a527df23. Bot's purchase-tariff endpoint
now accepts optional subscription_id to resolve the EXACT target row
by ID instead of doing a (user_id, tariff_id) re-lookup that races
with concurrent panel webhooks (produces 'Тариф уже активен' +
refund + no extension).

Frontend changes:
* subscriptionApi.purchaseTariff() — new optional subscriptionId arg
  appended after trafficGb. Forwarded as subscription_id in POST body.
* SubscriptionPurchase.tsx — forwards URL searchParam subscriptionId
  (set when user lands here from 'Renew this subscription').
* SubscriptionCardExpired.tsx — passes subscription.id when renewing
  an expired daily tariff (the .purchaseTariff(tariff_id, 1) call).

src/api/subscription.ts

@@ -398,6 +398,14 @@ export const subscriptionApi = {
     tariffId: number,
     periodDays: number,
     trafficGb?: number,
+    /**
+     * Subscription ID being renewed. Pass this when the user clicked
+     * "Renew" on an existing subscription so the backend can resolve
+     * the target row by ID instead of doing a (user_id, tariff_id)
+     * re-lookup that races with concurrent panel webhooks. Omit when
+     * this is a fresh purchase from the catalog.
+     */
+    subscriptionId?: number,
   ): Promise<{
     success: boolean;
     message: string;
@@ -411,6 +419,7 @@ export const subscriptionApi = {
       tariff_id: tariffId,
       period_days: periodDays,
       traffic_gb: trafficGb,
+      subscription_id: subscriptionId,
     });
     return response.data;
   },