feat: add admin traffic packages and device limit management UI

Add device limit +/- stepper, traffic packages display with inline
delete, add traffic dropdown from tariff config, translations for
ru/en/zh/fa.

src/api/adminUsers.ts

@@ -2,6 +2,15 @@ import apiClient from './client';
 
 // ============ Types ============
 
+export interface TrafficPurchaseInfo {
+  id: number;
+  traffic_gb: number;
+  expires_at: string;
+  created_at: string;
+  days_remaining: number;
+  is_expired: boolean;
+}
+
 export interface UserSubscriptionInfo {
   id: number;
   status: string;
@@ -16,6 +25,8 @@ export interface UserSubscriptionInfo {
   autopay_enabled: boolean;
   is_active: boolean;
   days_remaining: number;
+  purchased_traffic_gb: number;
+  traffic_purchases: TrafficPurchaseInfo[];
 }
 
 export interface UserPromoGroupInfo {
@@ -187,6 +198,11 @@ export interface UserAvailableTariff {
   price_per_day_kopeks: number;
   min_days: number;
   max_days: number;
+  device_price_kopeks: number | null;
+  max_device_limit: number | null;
+  traffic_topup_enabled: boolean;
+  traffic_topup_packages: Record<string, number>;
+  max_topup_traffic_gb: number;
   is_available: boolean;
   requires_promo_group: boolean;
 }
@@ -277,7 +293,10 @@ export interface UpdateSubscriptionRequest {
     | 'toggle_autopay'
     | 'cancel'
     | 'activate'
-    | 'create';
+    | 'create'
+    | 'add_traffic'
+    | 'remove_traffic'
+    | 'set_device_limit';
   days?: number;
   end_date?: string;
   tariff_id?: number;
@@ -286,6 +305,8 @@ export interface UpdateSubscriptionRequest {
   autopay_enabled?: boolean;
   is_trial?: boolean;
   device_limit?: number;
+  traffic_gb?: number;
+  traffic_purchase_id?: number;
 }
 
 export interface UpdateSubscriptionResponse {