docs: fix naming conventions across threading, math, memory, core, and debug modules

threading/:
- Rename 19 camelCase method files to hyphenated names
- task-system: createtaskgroup→create-task-group, etc.
- tasksystemconfig: enabletaskprofiling→enable-task-profiling, etc.
- thread: getcurrentid→get-current-id, etc.
- task: addref→add-ref, getid→get-id, etc.

math/:
- Rename underscore operator files to hyphenated
- vector3: operator_add→operator-add, etc.
- matrix4: gettranslation→get-translation, etc.
- vector4: tovector3→to-vector3, constructor_vector3→constructor-vector3
- sphere: sphere_constructor→sphere-constructor, etc.

memory/:
- Remove duplicate memorymanager/ folder (kept manager/ which was correct)

core/:
- filewriter: Consolidate ctor-default.md and ctor-file.md into constructor.md
- Rename dtor.md→destructor.md

debug/:
- filelogsink: Rename construct.md→constructor.md, ~filelogsink.md→destructor.md

All overview pages updated with new file references.

docs/api/threading/task/add-ref.md

@@ -0,0 +1,27 @@
+# ITask::AddRef
+
+```cpp
+void AddRef()
+```
+
+增加任务的引用计数。用于延长任务的生命周期，使其不会被自动释放。
+
+**参数：** 无
+
+**返回：** 无
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+ITask* task = new MyTask();
+task->AddRef(); // 保持引用，不会在 Release 时被删除
+task->SetPriority(TaskPriority::High);
+TaskSystem::Get().Submit(std::unique_ptr<ITask>(task));
+```
+
+## 相关文档
+
+- [ITask 总览](task.md) - 返回类总览
+- [Release](release.md) - 释放引用计数