feat(wip): room list support

Ragon.Server/Sources/Lobby/IRagonLobby.cs

@@ -21,6 +21,7 @@ namespace Ragon.Server.Lobby;
 
 public interface IRagonLobby
 {
+  public IReadOnlyList<IRagonRoom> Rooms { get; }
   public bool FindRoomById(string roomId, [MaybeNullWhen(false)] out RagonRoom room);
   public bool FindRoomByScene(string sceneName, [MaybeNullWhen(false)] out RagonRoom room);
   public void Persist(RagonRoom room);

Ragon.Server/Sources/Lobby/RagonLobbyDispatcher.cs

@@ -0,0 +1,33 @@
+using Ragon.Protocol;
+using Ragon.Server.Room;
+
+namespace Ragon.Server.Lobby;
+
+public class RagonLobbyDispatcher
+{
+  private IRagonLobby _lobby;
+
+  public RagonLobbyDispatcher(IRagonLobby lobby)
+  {
+    _lobby = lobby;
+  }
+
+  public void Write(RagonBuffer writer)
+  {
+    writer.Clear();
+    writer.Write((byte)RagonOperation.ROOM_LIST_UPDATED);
+    var rooms = _lobby.Rooms;
+
+    writer.WriteUShort((ushort)rooms.Count);
+    for (int i = 0; i < rooms.Count; i++)
+    {
+      var room = rooms[i];
+
+      writer.WriteString(room.Id);
+      writer.WriteString(room.Scene);
+      writer.WriteUShort((ushort)room.PlayerMax);
+      writer.WriteUShort((ushort)room.PlayerMin);
+      writer.WriteUShort((ushort)room.PlayerCount);
+    }
+  }
+}

Ragon.Server/Sources/Lobby/RagonLobbyInMemory.cs

@@ -25,6 +25,8 @@ public class LobbyInMemory : IRagonLobby
   private readonly List<RagonRoom> _rooms = new();
   private readonly Logger _logger = LogManager.GetCurrentClassLogger();
 
+  public IReadOnlyList<IRagonRoom> Rooms => _rooms.AsReadOnly();
+
   public bool FindRoomById(string roomId, [MaybeNullWhen(false)] out RagonRoom room)
   {
     foreach (var existRagonRoom in _rooms)