feat: 添加 Live2D 渲染插件及相关依赖，优化构建和启动脚本

.build.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 cd /home/showen/Showen/ShowenV2
 export PATH=/home/showen/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/bin:$PATH
-cargo check 2>&1 | grep -E "^error" | head -60
-echo "---SUMMARY---"
-cargo check 2>&1 | tail -3
+pkill -9 -f showen_v2 2>/dev/null
+sleep 1
+cargo build --release 2>&1 | tail -3
+echo "BUILD_EXIT=$?"