feat(live2d): implement OpenGL ES 2.0 rendering backend with EGL support

- Add `gl.rs` for OpenGL ES 2.0 and EGL context management.
- Introduce `mod.rs` to organize Live2D plugin modules.
- Create `model.rs` for loading and managing Cubism models, including parameter handling and drawable data extraction.
- Implement shader compilation and rendering context setup for Live2D models.

src/plugins/mod.rs

@@ -2,6 +2,7 @@ pub mod ai;
 pub mod ble;
 pub mod device;
 pub mod http;
+pub mod live2d;
 pub mod screen;
 pub mod video;
 pub mod wifi;