chore(auth): remove default credentials hint from login screen (v1.3.8)

public/index.php

@@ -176,11 +176,6 @@ $currentUser = Auth::getUsername();
                     Se connecter au PBX
                 </button>
             </form>
-
-            <div class="mt-6 pt-5 border-t border-anthracite-700 text-xs text-slate-300 flex items-center justify-between">
-                <span>Accès initial par défaut :</span>
-                <code class="px-2.5 py-1 rounded bg-anthracite-950 border border-anthracite-700 text-indigo-300 font-mono">admin / admin123</code>
-            </div>
         </div>
     </div>