docs: update memory and threading API docs

docs/api/memory/linear-allocator/get-name.md

@@ -0,0 +1,27 @@
+# LinearAllocator::GetName
+
+```cpp
+const char* GetName() const override;
+```
+
+返回分配器的名称字符串，用于调试和日志输出。
+
+**参数：** 无
+
+**返回：** 固定返回 `"LinearAllocator"`
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+#include <XCEngine/Memory/LinearAllocator.h>
+
+LinearAllocator allocator(1024);
+
+const char* name = allocator.GetName(); // "LinearAllocator"
+```
+
+## 相关文档
+
+- [LinearAllocator 总览](linear-allocator.md) - 返回类总览