Fix CSRF token issue in login and register forms

- Added @Html.AntiForgeryToken() to Register.cshtml
- Added @Html.AntiForgeryToken() to Login.cshtml
- Fixes 400 Bad Request errors on form submission

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

RR3CommunityServer/Pages/Login.cshtml

@@ -142,6 +142,7 @@
         }
 
         <form method="post">
+            @Html.AntiForgeryToken()
             <div class="form-group">
                 <label for="Username">Username or Email</label>
                 <input type="text" id="Username" name="Username" required autofocus />