feat: devices in subscription rows, set_devices action, table columns

- Remove "Days" column from main table (each subscription shows own)
- Tariff column shows ALL subscription tariffs as comma-separated list
- Subscription sub-rows show device count with phone icon
- New bulk action "Изменить устройства" (set_devices) with input 1-50
- Update UserListItemSubscription type with device_limit field
- i18n: setDevices + deviceLimit keys (ru + en)

src/api/adminUsers.ts

@@ -42,6 +42,7 @@ export interface UserListItemSubscription {
   days_remaining: number;
   traffic_used_gb: number;
   traffic_limit_gb: number;
+  device_limit: number;
 }
 
 export interface UserListItem {