Add paginated user retrieval functionality in AdminController and related services. Implemented UsersFilter for filtering user queries and added LastConnectionDate property to User model. Updated database schema and frontend API to support new user management features.

src/Managing.Infrastructure.Database/PostgreSql/Entities/UserEntity.cs

@@ -14,6 +14,7 @@ public class UserEntity
     public string? AvatarUrl { get; set; }
     public string? TelegramChannel { get; set; }
     public string? OwnerWalletAddress { get; set; }
+    public DateTimeOffset? LastConnectionDate { get; set; }
     public bool IsAdmin { get; set; }
 
     // Navigation properties