feat: reorganize admin panel around accounts

frontend/src/api/admin.ts

@@ -2,6 +2,8 @@ import api from './client'
 import type {
   DashboardMetrics,
   ActivityEntry,
+  AdminUserListResponse,
+  AdminAccountListResponse,
   AuditLogListResponse,
   PlanLimitConfig,
   AccountOverrideResponse,
@@ -78,7 +80,9 @@ export const adminApi = {
   createUser: (data: AdminUserCreate) =>
     api.post<AdminUserCreateResponse>('/admin/users', data).then(r => r.data),
   listUsers: (params?: Record<string, unknown>) =>
-    api.get('/admin/users', { params }).then(r => r.data),
+    api.get<AdminUserListResponse>('/admin/users', { params }).then(r => r.data),
+  listAccounts: (params?: Record<string, unknown>) =>
+    api.get<AdminAccountListResponse>('/admin/accounts', { params }).then(r => r.data),
   getUser: (id: string) =>
     api.get(`/admin/users/${id}`).then(r => r.data),
   updateUserRole: (id: string, role: string) =>