项目配置和文档更新

- 更新 .gitignore 屏蔽 node_modules、logs、.claude 等目录
- 更新 CLAUDE.md 项目开发文档
- 添加 start-system.sh 系统启动脚本

.gitignore

@@ -0,0 +1,45 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Node ###
+node_modules/
+
+### Logs ###
+logs/
+
+### Claude Code ###
+.claude/
+
+### Frontend Refactor Plan ###
+FRONTEND_REFACTOR_PLAN.md