remove role select and ban button entirely for own card

For your own user card, no role select and no ban button are rendered.

frontend/src/app/admin/users/page.tsx

@@ -77,18 +77,10 @@ export default function AdminUsersPage() {
       </div>
 
       {(() => {
-        const superadminCount = users.filter((u) => u.role === 'superadmin').length
         return (
           <div className="space-y-2">
             {users.map((user) => {
               const isSelf = user.id === currentUser?.id
-              const isLastSuperadmin = user.role === 'superadmin' && superadminCount <= 1
-              const roleDisabled = isSelf && (currentUser?.role !== 'superadmin' || isLastSuperadmin)
-              const roleTitle = isSelf
-                ? currentUser?.role !== 'superadmin'
-                  ? 'Вы не можете сменить свою роль'
-                  : 'Нельзя сменить роль единственного суперадмина'
-                : undefined
 
               return (
                 <div key={user.id} className="flex items-center justify-between rounded-lg border border-white/10 bg-white/5 p-4">
@@ -106,31 +98,28 @@ export default function AdminUsersPage() {
                     </div>
                     <p className="text-sm text-white/40">{user.email}</p>
                   </div>
-                  <div className="flex items-center gap-2">
-                    <div className="relative" title={roleTitle}>
+                  {!isSelf && (
+                    <div className="flex items-center gap-2">
                       <select value={user.role}
-                        disabled={roleDisabled}
                         onChange={(e) => updateUser(user.id, { role: e.target.value })}
-                        className={`rounded-lg border border-white/10 px-2 py-1.5 text-sm text-white outline-none transition ${
-                          roleDisabled ? 'cursor-not-allowed opacity-50' : 'bg-white/5'
-                        }`}
+                        className="rounded-lg border border-white/10 bg-white/5 px-2 py-1.5 text-sm text-white outline-none"
                       >
                         {Object.entries(roleLabels).map(([k, v]) => (
                           <option key={k} value={k} className="bg-[#1e293b]">{v}</option>
                         ))}
                       </select>
+                      <button onClick={() => updateUser(user.id, {
+                        status: user.status === 'banned' ? 'active' : 'banned'
+                      })}
+                        className={`rounded-lg px-3 py-1.5 text-sm transition ${
+                          user.status === 'banned' ? 'bg-green-600/80 text-white hover:bg-green-500' :
+                          'bg-red-600/80 text-white hover:bg-red-500'
+                        }`}
+                      >
+                        {user.status === 'banned' ? 'Разблокировать' : 'Заблокировать'}
+                      </button>
                     </div>
-                    <button onClick={() => updateUser(user.id, {
-                      status: user.status === 'banned' ? 'active' : 'banned'
-                    })}
-                      className={`rounded-lg px-3 py-1.5 text-sm transition ${
-                        user.status === 'banned' ? 'bg-green-600/80 text-white hover:bg-green-500' :
-                        'bg-red-600/80 text-white hover:bg-red-500'
-                      }`}
-                    >
-                      {user.status === 'banned' ? 'Разблокировать' : 'Заблокировать'}
-                    </button>
-                  </div>
+                  )}
                 </div>
               )
             })}