Fix RHI documentation discrepancies and add missing doc files

Fixed incorrect links in OpenGL documentation:
- Fixed wrong links to threading/task-system docs for Initialize/Shutdown methods
- Fixed wrong links to buffer docs for GetNativeHandle methods
- Fixed wrong links to shader docs for Bind/Unbind methods
- Fixed wrong links to command-list docs for Clear/Reset/Close methods
- Fixed wrong links to buffer/get-size.md for width/height methods

Added missing documentation files:
- OpenGL buffer: bind.md, unbind.md, get-type.md, initialize.md
- OpenGL fence: initialize.md, reset.md
- OpenGL swap-chain: get-size.md, initialize.md
- OpenGL render-target-view: initialize.md, shutdown.md, bind.md, unbind.md, clear.md, get-size.md
- OpenGL depth-stencil-view: initialize.md, shutdown.md, bind.md, unbind.md, get-size.md
- OpenGL command-list: clear.md

All links validated with fix_links.py - no broken references.

docs/api/rhi/opengl/command-list/clear.md

@@ -0,0 +1,24 @@
+# OpenGLCommandList::Clear
+
+```cpp
+void Clear(float r, float g, float b, float a, unsigned int buffers);
+```
+
+清除缓冲区。
+
+**参数：**
+- `r` - 红色分量
+- `g` - 绿色分量
+- `b` - 蓝色分量
+- `a` - Alpha 分量
+- `buffers` - 要清除的缓冲区标志
+
+**示例：**
+
+```cpp
+commandList->Clear(0.0f, 0.0f, 0.0f, 1.0f, Color | Depth);
+```
+
+## 相关文档
+
+- [OpenGLCommandList 总览](command-list.md) - 返回类总览