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.

.analyze.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+# 分析下载页面
+echo "=== Page size ==="
+wc -c /tmp/dl_page.html
+
+echo "=== All URLs containing download/zip/native ==="
+grep -oiE 'https?://[^"'\'' <>]+(download|\.zip|native|cubism)[^"'\'' <>]*' /tmp/dl_page.html | sort -u | head -40
+
+echo "=== Script sources ==="
+grep -oiE '<script[^>]*src="[^"]*"' /tmp/dl_page.html | head -20
+
+echo "=== Data attributes ==="
+grep -oiE 'data-[a-z]+="[^"]*"' /tmp/dl_page.html | head -20
+
+echo "=== Form actions ==="
+grep -oiE '<form[^>]*action="[^"]*"' /tmp/dl_page.html | head -10
+
+echo "=== Any cubism.live2d URLs ==="
+grep -oiE 'https?://[a-z.]*live2d[^"'\'' <>]*' /tmp/dl_page.html | sort -u | head -30
+
+echo "=== DONE ==="