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/on-complete.md

@@ -0,0 +1,39 @@
+# ITask::OnComplete
+
+```cpp
+virtual void OnComplete()
+```
+
+任务完成回调。可在派生类中重写此方法，以在任务执行完毕后执行清理或后续操作。
+
+**参数：** 无
+
+**返回：** 无
+
+**复杂度：** 取决于具体实现
+
+**示例：**
+
+```cpp
+class DataLoadTask : public ITask {
+public:
+    explicit DataLoadTask(const String& path) : m_path(path) {}
+    
+    void Execute() override {
+        m_data = LoadFromFile(m_path);
+    }
+    
+    void OnComplete() override {
+        printf("Data loaded, size: %zu\n", m_data.Size());
+        ProcessData(m_data);
+    }
+    
+private:
+    String m_path;
+    Containers::Vector<uint8_t> m_data;
+};
+```
+
+## 相关文档
+
+- [ITask 总览](task.md) - 返回类总览