配置 runtime 目录

- 保留 runtime 目录结构但忽略其内容
- 添加 .gitkeep 文件保持目录存在
- 更新 .gitignore 规则

.gitignore

@@ -54,6 +54,8 @@ docker/nacos/logs/
 docker/redis/data/
 docker/nginx/html/dist/*
 !docker/nginx/html/dist/.gitkeep
+runtime/*
+!runtime/.gitkeep
 *.jar
 !gradle/wrapper/gradle-wrapper.jar
 !.mvn/wrapper/maven-wrapper.jar