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.

.dl_core.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+# 尝试下载 Cubism SDK for Native (含 Core 库)
+cd /tmp
+echo "=== Try downloading Cubism SDK for Native ==="
+
+# Live2D 官方下载通常用这种 URL 模式
+# 先尝试常见的下载链接
+URLS=(
+  "https://cubism.live2d.com/sdk-native/bin/CubismSdkForNative.zip"
+  "https://www.live2d.com/download/cubism-sdk/download-native/?agree=true"
+  "https://download.live2d.com/cubism-sdk/native/CubismSdkForNative.zip"
+)
+
+for url in "${URLS[@]}"; do
+  echo "Trying: $url"
+  wget --timeout=15 --tries=1 -q "$url" -O test_download.bin 2>&1
+  if [ $? -eq 0 ]; then
+    SIZE=$(stat -c%s test_download.bin 2>/dev/null || echo 0)
+    echo "  Downloaded: $SIZE bytes"
+    if [ "$SIZE" -gt 100000 ]; then
+      echo "  Looks like a real file! Checking type..."
+      file test_download.bin
+      mv test_download.bin CubismSdkForNative.zip
+      echo "  SUCCESS: saved as CubismSdkForNative.zip"
+      exit 0
+    fi
+  else
+    echo "  Failed or too small"
+  fi
+  rm -f test_download.bin
+done
+
+echo "=== Direct URL attempts failed ==="
+echo "Checking actual download page for hidden links..."
+curl -sL "https://www.live2d.com/zh-CHS/sdk/download/native/" 2>/dev/null | grep -oiE 'href="[^"]*\.zip[^"]*"' | head -10
+echo "---"
+curl -sL "https://www.live2d.com/download/cubism-sdk/download-native/" 2>/dev/null | grep -oiE 'href="[^"]*download[^"]*"' | head -10
+
+echo "=== DONE ==="