✨ Add chat message handling and WebSocket integration

Introduce new `ChatService` for managing chat messages, including marking messages as read and checking read status. Add `WebSocketPacket` class for handling WebSocket communication and integrate it with `WebSocketService` to process chat-related packets. Enhance `ChatRoom` and `ChatMember` models with additional fields and relationships. Update `AppDatabase` to include new chat-related entities and adjust permissions for chat creation.

DysonNetwork.Sphere/Chat/ChatRoom.cs

@@ -37,6 +37,7 @@ public enum ChatMemberRole
 
 public class ChatMember : ModelBase
 {
+    public Guid Id { get; set; }
     public long ChatRoomId { get; set; }
     [JsonIgnore] public ChatRoom ChatRoom { get; set; } = null!;
     public long AccountId { get; set; }