Refactored AgeGroup namespace and services, added RegistrationKey functionality.

API/Controllers/AuthController.cs

@@ -1,10 +1,16 @@
-using Microsoft.AspNetCore.Mvc;
+using API.Models.Internal.User;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Identity.UI.Services;
+using Microsoft.AspNetCore.Mvc;
 
 namespace API.Controllers;
 
 [ApiController]
 [Route("api/account")]
-public class AuthController : ControllerBase
+public class AuthController(UserManager<User> userManager, SignInManager<User> signInManager, IEmailSender emailSender)
+    : ControllerBase
 {
-
+    private readonly UserManager<User> _userManager = userManager;
+    private readonly SignInManager<User> _signInManager = signInManager;
+    private readonly IEmailSender _emailSender = emailSender;
 }