Backend login and register

src/Application/Interfaces/IAuthenticationService.cs

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+using Application.Common.Results;
+using Application.DTOs;
+using Application.Models;
+
+namespace Application.Interfaces;
+
+public interface IAuthenticationService
+{
+    Task<Result> RegisterAsync(RegisterRequest request);
+    Task<Result> LoginAsync(LoginRequest request);
+    Task<Result> RefreshTokensAsync(RefreshTokenRequest request);
+    Task<Result> SendResetEmailAsync(string email);
+    Task<Result> ResetPasswordAsync(ResetPasswordDto resetPasswordDto);
+}

src/Application/Interfaces/IEmailService.cs

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+using Application.Models;
+
+namespace Application.Interfaces;
+
+public interface IEmailService
+{
+    void SendEmailAsync(EmailRequest emailRequest);
+}

src/Application/Interfaces/IJwtService.cs

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+using Domain.Entities;
+
+namespace Application.Interfaces;
+
+public interface IJwtService
+{
+    Task<string> GenerateTokenAsync(User user);
+    Task<string> GenerateAndSaveRefreshTokenAsync(User user);
+    Task<User?> ValidateRefreshTokenAsync(int userId, string refreshToken);
+}

src/Application/Interfaces/IUserService.cs

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+using Application.Common.Results;
+using Application.DTOs;
+using Application.Models;
+
+namespace Application.Interfaces;
+
+public interface IUserService
+{
+    Task<Result<PagedResult<UserDto>>> GetAsync(int pageNumber = 1, int pageSize = 10);
+    Task<Result<string>> UpdateAsync(UserUpdateRequest user);
+    Task<Result<string>> DeleteAsync(int id, int currentUserId);
+    Task<Result<UserDto>> GetUserByIdAsync(int id);
+    Task<Result<string>> AssignRoleAsync(AssingRoleRequest roleRequest);
+    Task<Result<string>> RevokeRoleAsync(AssingRoleRequest roleRequest);
+}