build: doker镜像构建时记录构建时间与gitcommit

- 镜像构建时会向项目目录内的version.json写入构建时间与commit-sha，并在镜像启动时输出日志
- 添加用于获取版本号的server api

entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+echo "Starting Nuxt App..."
+if [ -f "/app/version.json" ]; then
+  echo "Version info:"
+  cat /app/version.json
+else
+  echo "⚠️ version.json not found!"
+fi
+exec "$@"