fix(internal/service): 修复 GameShieldBackend 调用参数初始化问题

- 将 GameShieldBackend调用的参数从 req 修改为 GameShieldBackendArrayRequest 类型
- 初始化 GameShieldBackendArrayRequest 结构体，设置 HostId 和 Uid 字段
- 保持 Items 字段为 nil，以符合预期的调用方式

internal/service/gameshieldbackend.go

@@ -188,7 +188,7 @@ func (s *gameShieldBackendService) DeleteGameShieldBackend(ctx context.Context,
 			return "", err
 		}
 	}
-	res, _, err := s.GameShieldBackend(ctx, req)
+	res, _, err := s.GameShieldBackend(ctx, &v1.GameShieldBackendArrayRequest{HostId: req.HostId, Uid: req.Uid, Items: nil})
 	if err != nil {
 		return "", err
 	}