✨ 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/ChatController.cs

@@ -0,0 +1,12 @@
+using Microsoft.AspNetCore.Mvc;
+
+[ApiController]
+[Route("/chat")]
+public class ChatController : ControllerBase
+{
+    public class MarkMessageReadRequest
+    {
+        public Guid MessageId { get; set; }
+        public long ChatRoomId { get; set; }
+    }
+}