Add TestGuestLogout route to debug issue

Shogi.Api/Controllers/UserController.cs

@@ -91,4 +91,19 @@ public class UserController : ControllerBase
         await signOutTask;
         return Ok();
     }
+
+    [HttpPut("TestGuestLogout")]
+    public async Task<IActionResult> TestGuestLogout()
+    {
+        var signOutTask = HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
+
+        var userId = User?.GetShogiUserId();
+        if (!string.IsNullOrEmpty(userId))
+        {
+            connectionManager.Unsubscribe(userId);
+        }
+
+        await signOutTask;
+        return Ok();
+    }
 }