add: register and login with DB query AND some struct type correction

internal/api/service/auth_service.go

@@ -43,7 +43,7 @@ func (s *AuthService) Login(email, password string) (*models.LoginResponse, erro
 	}
 
 	if user == nil {
-		return nil, ErrInvalidCredentials
+		return nil, ErrUserNotFound
 	}
 
 	// Verify password
@@ -104,6 +104,7 @@ func (s *AuthService) Login(email, password string) (*models.LoginResponse, erro
 		redirectURL = "/"
 	}
 
+	// TODO: Apakah kita perlu param email untuk generate access token?
 	// Generate tokens
 	accessToken, err := s.jwtManager.GenerateAccessToken(user.ID, user.Email, user.Role, user.Name, additionalClaims)
 	if err != nil {