Update API documentation and remove obsolete plan files

docs/api/rhi/d3d12/command-list/clear-unordered-access-view.md

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+# D3D12CommandList::ClearUnorderedAccessView
+
+```cpp
+void ClearUnorderedAccessView(
+    D3D12_GPU_DESCRIPTOR_HANDLE viewHandle,
+    D3D12_CPU_DESCRIPTOR_HANDLE resourceHandle,
+    ID3D12Resource* unorderedAccess,
+    const float values[4],
+    uint32_t rectCount = 0,
+    const D3D12_RECT* rects = nullptr
+);
+```
+
+清除无序访问视图。
+
+**参数：**
+- `viewHandle` - GPU 描述符句柄
+- `resourceHandle` - CPU 描述符句柄
+- `unorderedAccess` - UAV 资源指针
+- `values` - 清除值 [x, y, z, w]
+- `rectCount` - 清除矩形数量
+- `rects` - 清除矩形数组
+
+**复杂度：** O(n) 其中 n 为 rectCount
+
+## 相关文档
+
+- [D3D12CommandList 总览](command-list.md) - 返回类总览