Add AutoMapper and message response models

Introduced AutoMapper to the API project and registered it in the DI container. Added mapping profiles for core models to DTOs and response objects. Refactored controllers to use AutoMapper for mapping entities to response DTOs. Implemented new response models for messages, media attachments, reactions, and views. Updated MessagesLoader to load messages with related data. Added a migration to support ChatGroupId in messages. Updated dependencies and fixed minor issues in related files.

Govor.Core/Models/ChatGroup.cs

@@ -1,3 +1,5 @@
+using Govor.Core.Models.Messages;
+
 namespace Govor.Core.Models;
 
 public class ChatGroup
@@ -11,7 +13,8 @@ public class ChatGroup
     public List<GroupAdmins> Admins { get; set; } = new();
     public List<GroupMembership> Members { get; set; } = new();
     public List<GroupInvitation> InviteCodes { get; set; } = new();
-
+    public List<Message> Messages { get; set; } = new();
+    
     public override bool Equals(object? obj)
     {
         ChatGroup chatGroup = obj as ChatGroup;

Govor.Core/Models/PrivateChat.cs

@@ -7,7 +7,7 @@ public class PrivateChat
     public Guid Id { get; set; }
     public Guid UserAId { get; set; }
     public Guid UserBId { get; set; }
-    public List<Message> Messages { get; set; } =  new List<Message>();
+    public List<Message> Messages { get; set; } =  new();
 
     public override bool Equals(object? obj)
     {

Govor.Core/Repositories/PrivateChats/IPrivateChatsRepository.cs

@@ -1,3 +1,5 @@
+using Govor.Core.Repositories.Groups;
+
 namespace Govor.Core.Repositories.PrivateChats;
 
 public interface IPrivateChatsRepository : IPrivateChatsReader, IPrivateChatsWriter, IPrivateChatsExist