docs: 重构 API 文档结构并修正源码准确性

- 重组文档目录结构: 每个模块的概述页移动到模块子目录
- 重命名 index.md 为 main.md
- 修正所有模块文档中的错误:
  - math: FromEuler→FromEulerAngles, TransformDirection 包含缩放, Box 是 OBB, Color::ToRGBA 格式
  - containers: 新增 operator==/!= 文档, 补充 std::hash DJB 算法细节
  - core: 修复 types 链接错误
  - debug: LogLevelToString 返回大写, timestamp 是秒, Profiler 空实现标注, Windows API vs ANSI
  - memory: 修复头文件路径, malloc vs operator new, 新增方法文档
  - resources: 修复 Shader/Texture 链接错误
  - threading: TaskSystem::Wait 空实现标注, ReadWriteLock 重入描述, LambdaTask 链接
- 验证: fix_links.py 确认 0 个断裂引用

docs/api/rhi/device/create-texture.md

@@ -0,0 +1,38 @@
+# RHIDevice::CreateTexture
+
+```cpp
+virtual RHITexture* CreateTexture(const TextureDesc& desc) = 0;
+```
+
+创建 GPU 纹理资源。
+
+**参数：**
+- `desc` - 纹理描述符，包含尺寸、格式、纹理类型等
+
+**返回：** 新创建的纹理指针，失败返回 `nullptr`
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+TextureDesc textureDesc;
+textureDesc.width = 1024;
+textureDesc.height = 1024;
+textureDesc.depth = 1;
+textureDesc.mipLevels = 1;
+textureDesc.arraySize = 1;
+textureDesc.format = (uint32_t)Format::R8G8B8A8_UNorm;
+textureDesc.textureType = (uint32_t)TextureType::Texture2D;
+textureDesc.sampleCount = 1;
+textureDesc.sampleQuality = 0;
+textureDesc.flags = 0;
+
+RHITexture* texture = device->CreateTexture(textureDesc);
+```
+
+## 相关文档
+
+- [RHIDevice 总览](device.md) - 返回类总览
+- [RHITexture](../texture/texture.md) - 纹理类
+- [TextureDesc](../types/types.md) - 纹理描述结构体