docs: update README.md and fix components module docs

- Update README.md project structure docs/api section
  - Add missing audio/, components/, scene/ directories
  - Reorder alphabetically
- Update Components test count from 2+ to 3
- Expand documentation section with module listings
- Remove incomplete audio-source and audio-listener component docs
  from components.md (referenced 30+ and 16+ non-existent method docs)

docs/api/components/components.md

@@ -25,13 +25,6 @@ Components 模块是 XCEngine ECS 架构中的组件层，提供各种游戏对
 |------|------|------|
 | [TransformComponent](transform-component/transform-component.md) | `TransformComponent.h` | 变换组件，包含位置、旋转、缩放 |
 
-### 音频组件
-
-| 组件 | 文件 | 描述 |
-|------|------|------|
-| [AudioSourceComponent](audio-source/audio-source-component.md) | `AudioSourceComponent.h` | 音频源组件，负责播放音频 |
-| [AudioListenerComponent](audio-listener/audio-listener-component.md) | `AudioListenerComponent.h` | 音频监听器组件，接收声音 |
-
 ## 使用示例
 
 ```cpp