fix(gateway): TaskListQuery 测试构造补 root_thread_id 字段

两处 list_task_forest 路由测试构造 TaskListQuery 缺了新增的 root_thread_id(E0063);cargo check 默认不编译 test 所以没抓到、CI --all-targets 才报。补 None,cargo check --all-targets 已过。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Pyiner

garyx-gateway/src/tasks.rs

@@ -1814,6 +1814,7 @@ mod tests {
                 source_thread_id: None,
                 source_task_id: None,
                 source_bot_id: None,
+                root_thread_id: None,
                 include_done: true,
                 scope: TaskForestScope::All,
                 limit: None,
@@ -1927,6 +1928,7 @@ mod tests {
                 source_thread_id: None,
                 source_task_id: None,
                 source_bot_id: None,
+                root_thread_id: None,
                 include_done: true,
                 scope: TaskForestScope::default(),
                 limit: None,