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/thread/get-id.md

@@ -0,0 +1,44 @@
+# Thread::GetId
+
+```cpp
+Id GetId() const;
+```
+
+返回当前线程对象的唯一标识符。线程 ID 是 `uint64_t` 类型的值，通过 `std::thread::native_handle()` 获取原生线程句柄并转换为整数。
+
+线程 ID 在线程启动后生效。在调用 `Start()` 之前，`GetId()` 返回 0。
+
+**参数：** 无
+
+**返回：** 线程的唯一标识符，线程未启动时返回 0
+
+**线程安全：** ✅
+
+**示例：**
+
+```cpp
+#include "XCEngine/Threading/Thread.h"
+#include <iostream>
+
+using namespace XCEngine::Threading;
+
+int main() {
+    Thread t;
+    
+    std::cout << "Before Start - Thread ID: " << t.GetId() << std::endl;
+    
+    t.Start([]() {
+        std::cout << "Worker ID: " << Thread::GetCurrentId() << std::endl;
+    }, "WorkerThread");
+    
+    std::cout << "After Start - Thread ID: " << t.GetId() << std::endl;
+    
+    t.Join();
+    return 0;
+}
+```
+
+## 相关文档
+
+- [Thread 总览](thread.md) - 返回类总览
+- [GetCurrentId](getcurrentid.md) - 获取当前执行线程的 ID