feat: 添加 Live2D 渲染插件及相关依赖，优化构建和启动脚本

.run.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+killall showen_v2 2>/dev/null
+sleep 1
+cd /home/showen/Showen/ShowenV2
+DISPLAY=:0 RUST_LOG=info nohup ./target/release/showen_v2 --config configs/live2d_anime.json > /tmp/sl2.log 2>&1 &
+echo "PID=$!"
+sleep 8
+echo "=== LOG ==="
+cat /tmp/sl2.log | tail -50
+echo "=== PS ==="
+ps aux | grep showen_v2 | grep -v grep