feat: enhance admin user detail with campaign, panel data, node usage

- Add campaign card and referrals list to info tab
- Add panel config/links, live traffic, connection info to subscription tab
- Add node usage bars with 7/14/30 day period selector
- Add getPanelInfo/getNodeUsage API methods and types
- Add 18 new i18n keys across 4 languages

src/api/adminUsers.ts

@@ -101,6 +101,8 @@ export interface UserDetailResponse {
   used_promocodes: number;
   has_had_paid_subscription: boolean;
   lifetime_used_traffic_bytes: number;
+  campaign_name: string | null;
+  campaign_id: number | null;
   restriction_topup: boolean;
   restriction_subscription: boolean;
   restriction_reason: string | null;
@@ -111,6 +113,33 @@ export interface UserDetailResponse {
   remnawave_uuid: string | null;
 }
 
+export interface UserPanelInfo {
+  found: boolean;
+  trojan_password: string | null;
+  vless_uuid: string | null;
+  ss_password: string | null;
+  subscription_url: string | null;
+  happ_link: string | null;
+  used_traffic_bytes: number;
+  lifetime_used_traffic_bytes: number;
+  traffic_limit_bytes: number;
+  first_connected_at: string | null;
+  online_at: string | null;
+  last_connected_node_uuid: string | null;
+  last_connected_node_name: string | null;
+}
+
+export interface UserNodeUsageItem {
+  node_uuid: string;
+  node_name: string;
+  total_bytes: number;
+}
+
+export interface UserNodeUsageResponse {
+  items: UserNodeUsageItem[];
+  period_days: number;
+}
+
 export interface UsersStatsResponse {
   total_users: number;
   active_users: number;
@@ -508,4 +537,18 @@ export const adminUsersApi = {
     const response = await apiClient.post(`/cabinet/admin/users/${userId}/disable`);
     return response.data;
   },
+
+  // Get panel info
+  getPanelInfo: async (userId: number): Promise<UserPanelInfo> => {
+    const response = await apiClient.get(`/cabinet/admin/users/${userId}/panel-info`);
+    return response.data;
+  },
+
+  // Get node usage
+  getNodeUsage: async (userId: number, days = 7): Promise<UserNodeUsageResponse> => {
+    const response = await apiClient.get(`/cabinet/admin/users/${userId}/node-usage`, {
+      params: { days },
+    });
+    return response.data;
+  },
 };