fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
- Improve link styling with underline decoration
- Hide leaf nodes from tree, only show directories
- Fix log file path for packaged app

docs/api/rhi/opengl/README.md

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+# OpenGL 后端组件
+
+OpenGL 后端已创建以下组件文件夹和文档：
+
+- `device/` - OpenGLDevice
+- `buffer/` - OpenGLBuffer
+- `texture/` - OpenGLTexture
+- `command-list/` - OpenGLCommandList
+- `command-queue/` - OpenGLCommandQueue
+- `swap-chain/` - OpenGLSwapChain
+- `fence/` - OpenGLFence
+- `shader/` - OpenGLShader
+- `pipeline-state/` - OpenGLPipelineState
+- `sampler/` - OpenGLSampler
+- `vertex-array/` - OpenGLVertexArray
+- `render-target-view/` - OpenGLRenderTargetView
+- `depth-stencil-view/` - OpenGLDepthStencilView
+
+每个组件文件夹包含:
+- `{component}.md` - 类总览
+- `methods.md` - 方法详细文档
+
+## 相关文档
+
+- [OpenGL 后端总览](overview.md)
+- [RHI 抽象层](overview.md)