Fix broken links in Threading API docs

Fix 14 broken cross-references in docs/api/threading/:
- lambda-task path: lambdatask -> lambda-task (5 occurrences)
- task-system-config path: tasksystemconfig -> task-system-config (6 occurrences)
- read-write-lock self-ref: readwritelock -> read-write-lock (6 occurrences)
- task-system cross-method: createtaskgroup/destroytaskgroup -> create-task-group/destroy-task-group
- thread cross-method: getcurrentid/getid -> get-current-id/get-id

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/api/threading/thread/get-current-id.md

@@ -40,4 +40,4 @@ int main() {
 ## 相关文档
 
 - [Thread 总览](thread.md) - 返回类总览
-- [GetId](getid.md) - 获取 Thread 对象的 ID
+- [GetId](get-id.md) - 获取 Thread 对象的 ID