feat: add session capacity waitlist

src/GmRelay.Bot/Features/Sessions/ListSessions/DeleteSessionHandler.cs

@@ -74,16 +74,23 @@ public sealed class DeleteSessionHandler(
         // A simple way is to re-render the list:
         await using var readConnection = await dataSource.OpenConnectionAsync(ct);
         var sessions = await readConnection.QueryAsync<SessionListItemDto>(
-            @"SELECT s.id as Id, s.title as Title, s.scheduled_at as ScheduledAt, s.status as Status, 
-                     COUNT(sp.id) FILTER (WHERE sp.is_gm = false) as PlayerCount,
+            @"SELECT s.id as Id, s.title as Title, s.scheduled_at as ScheduledAt, s.status as Status, s.max_players as MaxPlayers,
+                     COUNT(sp.id) FILTER (WHERE sp.is_gm = false AND sp.registration_status = @Active) as PlayerCount,
+                     COUNT(sp.id) FILTER (WHERE sp.is_gm = false AND sp.registration_status = @Waitlisted) as WaitlistCount,
                      g.gm_telegram_id as GmId
               FROM sessions s
               JOIN game_groups g ON s.group_id = g.id
               LEFT JOIN session_participants sp ON s.id = sp.session_id
               WHERE g.telegram_chat_id = @ChatId AND s.status != @Cancelled AND s.scheduled_at > NOW()
-              GROUP BY s.id, s.title, s.scheduled_at, s.status, g.gm_telegram_id
+              GROUP BY s.id, s.title, s.scheduled_at, s.status, s.max_players, g.gm_telegram_id
               ORDER BY s.scheduled_at ASC",
-            new { ChatId = command.ChatId, Cancelled = SessionStatus.Cancelled });
+            new
+            {
+                ChatId = command.ChatId,
+                Cancelled = SessionStatus.Cancelled,
+                Active = ParticipantRegistrationStatus.Active,
+                Waitlisted = ParticipantRegistrationStatus.Waitlisted
+            });
 
         var sessionsList = sessions.ToList();
 
@@ -96,7 +103,11 @@ public sealed class DeleteSessionHandler(
         var text = "📅 <b>Ближайшие игры:</b>\n\n";
         foreach (var s in sessionsList)
         {
-            text += $"🔹 <b>{s.ScheduledAt.FormatMoscow()}</b> — {System.Net.WebUtility.HtmlEncode(s.Title)} (Участников: {s.PlayerCount})\n";
+            var seats = s.MaxPlayers.HasValue
+                ? $"{s.PlayerCount}/{s.MaxPlayers.Value}"
+                : s.PlayerCount.ToString(System.Globalization.CultureInfo.InvariantCulture);
+            var waitlist = s.WaitlistCount > 0 ? $", ожидание: {s.WaitlistCount}" : string.Empty;
+            text += $"🔹 <b>{s.ScheduledAt.FormatMoscow()}</b> — {System.Net.WebUtility.HtmlEncode(s.Title)} (Места: {seats}{waitlist})\n";
         }
 
         var isGm = command.TelegramUserId == sessionsList.First().GmId;