✨ 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/Post/PostService.cs

@@ -59,7 +59,7 @@ public class PostService(AppDatabase db, FileService fs, ActivityService act)
                     break;
             }
 
-            using var newDocument = JsonDocument.Parse(JsonSerializer.Serialize(truncatedArrayElements));
+            var newDocument = JsonDocument.Parse(JsonSerializer.Serialize(truncatedArrayElements));
             item.Content = newDocument;
         }