Fix Logout method to return IActionResult

[Copilot]

The Logout method was declared as async Task without returning an IActionResult, preventing proper response handling by the ASP.NET Core framework.

Changes

• Changed method signature to async Task<IActionResult>
• Added RedirectToAction("Index", "Home") return statement after sign-out operations

[Authorize]
public async Task<IActionResult> Logout()
{
    var authenticationProperties = new LogoutAuthenticationPropertiesBuilder()
        .WithRedirectUri(Url.Action("Index", "Home"))
        .Build();

    await HttpContext.SignOutAsync(Auth0Constants.AuthenticationScheme, authenticationProperties);
    await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
    
    return RedirectToAction("Index", "Home");
}

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