feat: add reset traffic toggle on tariff switch

- Add reset_traffic parameter to previewTariffSwitch and switchTariff API calls
- Add reset_traffic_available/reset_traffic_default fields to TariffSwitchPreview type
- Add toggle switch in tariff switch preview modal (shown when backend enables it)
- Initialize toggle from server default (reset_traffic_default)
- Pass reset_traffic flag on switch execution
- Add translations for all 4 locales (ru, en, zh, fa)

src/api/subscription.ts

@@ -345,6 +345,7 @@ export const subscriptionApi = {
   // Preview tariff switch cost
   previewTariffSwitch: async (
     tariffId: number,
+    resetTraffic?: boolean,
   ): Promise<{
     can_switch: boolean;
     current_tariff_id: number | null;
@@ -364,10 +365,14 @@ export const subscriptionApi = {
     base_upgrade_cost_kopeks?: number;
     discount_percent?: number;
     discount_kopeks?: number;
+    // Traffic reset on switch
+    reset_traffic_available?: boolean;
+    reset_traffic_default?: boolean;
   }> => {
     const response = await apiClient.post('/cabinet/subscription/tariff/switch/preview', {
       tariff_id: tariffId,
-      period_days: 30, // Default period for switch
+      period_days: 30,
+      ...(resetTraffic !== undefined && { reset_traffic: resetTraffic }),
     });
     return response.data;
   },
@@ -375,6 +380,7 @@ export const subscriptionApi = {
   // Switch to a different tariff
   switchTariff: async (
     tariffId: number,
+    resetTraffic?: boolean,
   ): Promise<{
     success: boolean;
     message: string;
@@ -389,6 +395,7 @@ export const subscriptionApi = {
     const response = await apiClient.post('/cabinet/subscription/tariff/switch', {
       tariff_id: tariffId,
       period_days: 30,
+      ...(resetTraffic !== undefined && { reset_traffic: resetTraffic }),
     });
     return response.data;
   },