Refactor user registration process to use UserRegistrationDto;

implement user registration in seed app

web/backend/Features/Features.Auth/Repository/AuthRepository.cs

@@ -1,6 +1,7 @@
 using System.Data;
 using System.Data.Common;
 using Domain.Entities;
+using Features.Auth.Dtos;
 using Infrastructure.Sql;
 using Microsoft.Data.SqlClient;
 
@@ -35,12 +36,7 @@ public class AuthRepository(ISqlConnectionFactory connectionFactory)
     /// <exception cref="Exception">Thrown when the newly registered user cannot be retrieved after registration.</exception>
     /// <exception cref="Microsoft.Data.SqlClient.SqlException">Thrown when the database command fails.</exception>
     public async Task<UserAccount> RegisterUserAsync(
-        string username,
-        string firstName,
-        string lastName,
-        string email,
-        DateTime dateOfBirth,
-        string passwordHash
+        UserRegistrationDto userRegistrationDto
     )
     {
         await using DbConnection connection = await CreateConnection();
@@ -49,6 +45,9 @@ public class AuthRepository(ISqlConnectionFactory connectionFactory)
         command.CommandText = "USP_RegisterUser";
         command.CommandType = CommandType.StoredProcedure;
 
+        var (username, firstName, lastName, email, dateOfBirth, passwordHash) =
+            userRegistrationDto;
+
         AddParameter(command, "@Username", username);
         AddParameter(command, "@FirstName", firstName);
         AddParameter(command, "@LastName", lastName);

web/backend/Features/Features.Auth/Repository/IAuthRepository.cs

@@ -1,7 +1,7 @@
 using Domain.Entities;
+using Features.Auth.Dtos;
 
 namespace Features.Auth.Repository;
-
 /// <summary>
 ///     Repository for authentication-related database operations including user registration and credential management.
 /// </summary>
@@ -11,20 +11,8 @@ public interface IAuthRepository
     ///     Registers a new user with account details and initial credential.
     ///     Uses stored procedure: USP_RegisterUser
     /// </summary>
-    /// <param name="username">Unique username for the user</param>
-    /// <param name="firstName">User's first name</param>
-    /// <param name="lastName">User's last name</param>
-    /// <param name="email">User's email address</param>
-    /// <param name="dateOfBirth">User's date of birth</param>
-    /// <param name="passwordHash">Hashed password</param>
-    /// <returns>The newly created UserAccount with generated ID</returns>
     Task<UserAccount> RegisterUserAsync(
-        string username,
-        string firstName,
-        string lastName,
-        string email,
-        DateTime dateOfBirth,
-        string passwordHash
+        UserRegistrationDto userRegistrationDto
     );
 
     /// <summary>