[fix] extract LoadAllKeysAsync method and grant root users full key access

Author: i4004

src/EtcdTerminal.App/Screens/KeyBrowseScreen.cs

@@ -56,27 +56,37 @@ private async Task LoadKeysAsync()
 	{
 		var authEnabled = await _etcdClient.IsAuthenticationEnabledAsync();
 
+		async Task<List<EtcdKeyValue>> LoadAllKeysAsync()
+		{
+			var keys = await _etcdClient.GetKeysByPrefixAsync("");
+
+			if (keys.Count > 0)
+				return [.. keys];
+
+			return [.. await _etcdClient.GetKeysByPrefixAsync("/")];
+		}
+
 		if (!authEnabled)
 		{
-			_allKeys = [.. await _etcdClient.GetKeysByPrefixAsync("")];
+			_allKeys = await LoadAllKeysAsync();
 		}
 		else
 		{
 			var username = _config.Username;
 
 			if (username is null)
 			{
-				_allKeys = [.. await _etcdClient.GetKeysByPrefixAsync("")];
+				_allKeys = await LoadAllKeysAsync();
 				_filteredKeys = [.. _allKeys];
 
 				return;
 			}
 
 			var user = await _etcdClient.GetUserAsync(username);
 
-			if (user is null || user.Roles.Count == 0)
+			if (user is null || user.Roles.Count == 0 || user.Roles.Contains("root"))
 			{
-				_allKeys = [.. await _etcdClient.GetKeysByPrefixAsync("")];
+				_allKeys = await LoadAllKeysAsync();
 			}
 			else
 			{